Non Repeated Random Numbers Generator

Instructions: Use this non-repeated random number generator to create a sequence of random numbers that are all different. Please provide the minimum and maximum values, and how many numbers you want to generate:

random number generator that doesn't repeat

Random Number Generator of non-repeated values

Generating random numbers is usually a difficult task, because it is argued by mathematicians that those "random" numbers that are generated by a computer really random number, but rather they are pseudo random numbers.

The reason behind that is that often times computer system will generate the same sequences of random numbers over and over.

random number generator that doesn't repeat

Will this Random number generator give numbers with no repeats

Yes. With this generator, numbers will be repeatedly generated until we get a list of \(n\) different random numbers.

If you want to generate random numbers that are purely random and repeats can happen, you can use this regular random number generator .

What can I use non-repeat randomly generated numbers for?

Great question! One of the most common uses of non-repeated randomly generated numbers is to draw a random sample from a given dataset.

Now, if that is what you are looking for, probably you should take a look at our random sample generator.

Related Calculators

Histogram Maker

log in to your account

Reset password.

Random Number Generator

Pick a number - how to use the random number generator., possible applications of the random number picker, what is rng, and how do random number generators work, true random number generators and pseudorandom number generators.

This random number generator can produce pseudorandom numbers within a given range. You can pick numbers from -999,999,999,999,999 to 999,999,999,999,999, choose to generate decimals or integers, include or exclude the minimum and maximum values, disallow duplicates (random number generator with no repeats), and sort results from smallest to largest.

It can serve as a single random number picker or a random number list generator . In the text below, you'll find information on how to use this random sequence generator. It will also answer the questions: "what is RNG?", "what is the difference between pseudorandom number generators and true random number generators?" and "how do random number generators work?"

The numbers generated by this lucky number generator are pseudorandom - not truly random, but suitable for most purposes. However, be careful if you want to use it to encrypt top-secret government documents.

Single random number generator

If you want to generate one random number, choose a number that will be the lower limit (the minimum value), and then pick a number that will be the upper limit (the maximum value). To generate again, click the arrow below the "Result" field. (Make sure the "autosave" option is turned on by clicking the floppy disk icon next to the "Minimum value" and "Maximum value" fields).

By default, minimum and maximum values are included in the range of numbers generated. If you want to exclude them, click "advanced mode" (below the "Result" field), and you'll see the option to exclude one or both.

You can also generate decimals (up to two decimal places) - to do that change the "type of number(s)" setting.

Random number list generator

If you choose the "multiple numbers" option in the "Generate" field, input how many numbers you need, and you'll see a sequence of random numbers.

In the advanced mode, you can also choose whether you want to allow duplicates in the random list and whether you want the results to be sorted (from smallest to largest).

If you want to generate numbers with the same settings again, click the "autosave" option to the right of the variables you want to stay the same.

Here are some ways you can use the random number generator. It may be helpful if you need the following:

a random number list generator (random number table generator)

Choose the "multiple numbers" option and input how many numbers you need (the list's length).

a phone number generator

Choose the "multiple numbers," enter "7" into the "how many" field (or another adequate number if you're not in the USA), and set the minimum value to 0 and the maximum value to 9. If 0 is the first number of the sequence, try again. The sequence will be a random phone number.

a random 4-digit number generator

Set the minimum value to 1,000 and the maximum value to 9,999.

a random number sequence generator

Works the same as a random list generator; see above.

a random number generator no repeats

If you generate multiple numbers and want no repeats, go to advanced mode and set "no" in the "allow duplicates" section.

to pick a random number between 69 and 666

Set the minimum value to 69 and the maximum value to 666. RNGesus will forgive you. 😈

to choose a random number between 1 and 4

Set the minimum value to 1 and the maximum value to 4.

to generate 5 random numbers

Choose "multiple numbers" in the first field and enter "5" in the "how many" field.

to pick a number from 1 to 10

Set the minimum value to 1 and the maximum value to 10.

RNG (random number generator) is a device that produces a sequence of numbers that can't be predicted (each outcome has the same probability of being chosen).

Rolling dice is a random hardware number-generating method (and our dice probability calculator is its analog version). Each result has the same chance of appearing ( P = 1/6 ). The same goes for flipping a coin - in our coin flip probability calculator , you can calculate the probability of getting heads and figure it's equal to 50%, and so is the probability of getting tails (not including the possibility of it landing on its side). If you're curious enough, you can try flipping a coin 100 times to check that the longer you flip, the closer you get to an even distribution of outcomes. This phenomenon is known as the law of large numbers.

Although rolling dice is fun, using a software is much quicker and more convenient. But how can computers produce random results if they're entirely deterministic? All that computers do is follow instructions, so how can anything they do be random?

One solution is relying on some external input, which is truly random. For example, computers can use data from a piece of hardware that measures a random physical phenomenon like background radiation. These types of devices are called true random number generators.

Another way is to produce an outcome that seems unpredictable but, in fact, is the result of a strictly defined mathematical process. Software that does this is called a pseudorandom number generator . It takes in a "random enough" number (a seed), e.g., a part of the current time in the system's clock, and performs a function on it. The result is a pseudorandom number.

For many purposes (like gameplay or graphics), pseudorandom generators are enough, but true random number generators are needed especially for encryption.

This number generator is pseudorandom and uses the JavaScript function Math.random(). The algorithm which produces the result depends on the web browser you use. Nowadays, most browsers use the xorshift128+ algorithm, which is based on bitwise operations, which are manipulation of data at the level (learn what a bit is in our byte conversion tool)

What does RNG mean?

RNG stands for random number generator. It is an algorithm that produces a sequence of numbers that can't be predicted, so each outcome has the same probability of being chosen.

We distinguish between true random number generators (TRNG) and pseudorandom number generators (PRGN). PRNG are often used in computer games while TRNG are used for encryption.

How do random number generators work?

There are two main principles to generate random numbers:

  • True random number generator algorithms take the current value of a physical environmental attribute that is constantly changing in a way that is practically impossible to model.
  • Pseudorandom number generator algorithms reproduce numbers by taking a seed as an input and performing a precisely defined algorithm on it.

What is a pseudorandom number?

A pseudorandom number is an outcome that seems unpredictable but, in fact, is the result of a strictly defined mathematical process. The algorithms of pseudorandom number generators (PRGN) take a seed to create random numbers. They are used widely in simulations, computer programming, and as long as the seed stays a secret, also in cryptography.

How to generate a new phone number?

To generate a new phone number:

  • In the random number generator, choose the adequate number of digits for a phone number of your desired country (7 digits for USA).
  • Set the minimum value to 0 and the maximum value to 9.
  • If 0 is the first number of the sequence, let the generator run again.
  • The resulting sequence will be a random phone number.

How to generate a random number in Python?

There are many ways to generate a pseudorandom number or sequence in Python. Here are some useful ones:

  • random.randint(a, b) generates random integers;
  • random.random(a, b) generates floating point numbers; and
  • random.sample(a, b, length_of_list) generates sequences of random numbers.

Consult Python's documentation for more functions in the random module.

Beware: Python uses the Mersenne Twister algorithm as its default PRNG. It is completely unsuitable for cryptographic purposes because its seeds are predictable.

Books vs e-books

Normal approximation.

  • Biology ( 98 )
  • Chemistry ( 98 )
  • Construction ( 144 )
  • Conversion ( 291 )
  • Ecology ( 29 )
  • Everyday life ( 259 )
  • Finance ( 565 )
  • Food ( 66 )
  • Health ( 438 )
  • Math ( 658 )
  • Physics ( 508 )
  • Sports ( 104 )
  • Statistics ( 182 )
  • Other ( 180 )
  • Discover Omni ( 40 )

Random Number Generator 🎲

Use this random generator to get a truly random, cryptographically safe number. It generates random numbers (with no repeats, or with repeats) that can be used where unbiased randomization is needed such as when drawing numbers for a lottery, raffle, giveaway, or sweepstake. An RNG draw can also be used for determining who goes first in a game, and so on.

    Generation result

Related calculators.

  • How to pick a random number between two numbers?
  • Where are random numbers useful?
  • Generating a random number

Sources of randomness

  • True random versus pseudo random number generators

    How to pick a random number between two numbers?

You can use this random number generator to pick a truly random number between any two numbers. For example, to get a random number between 1 and 10 , including 10, enter 1 in the first field and 10 in the second, then press "Get Random Number". Our number randomizer will pick a number from 1 through 10 at random. To generate a random number between 1 and 100, do the same, but with 100 in the second field of the picker.

To simulate a dice roll , the range should be 1 to 6 for a standard six-sided dice. To perform the equivalent of a coin flip , set the range between 1 and 2 and the random selector will pick a number between 1 and 2.

To generate more than one random number from a min-max range , just select how many you need from the drop-down below. To generate unique numbers with no repeats, leave the "no repeats" checkbox on. For example, selecting to draw 6 numbers out of the set of 1 to 49 possible would be equivalent to simulating a lottery draw for a game with these parameters. If you want numbers with repeats, just flip the "no repeats" checkbox to its off state and the same number may be drawn repeatedly by chance.

    Where are random numbers useful?

You might be organizing a charity lottery , a giveaway, a raffle, a sweepstakes, etc. and you need to draw a winner - this number generator is for you! It is completely unbiased and outside of your control , so you can assure your crowd of the fairness of the draw, which might not be true if you are using standard methods like rolling a dice. If you need to choose several among the participants instead, just select the number of unique numbers you want generated by our random number picker and you are all set. However, it is usually best to draw the winners one after another, to keep the tension for longer (discarding repeat draws as you go).

A random number generator is also useful if you need to decide who goes first in some game or activity, such as board games, sport games and sports competitions. The same is true if you need to decide the participation order for multiple players / participants. Picking a team at random or randomizing a list of participants also depends on randomness.

random numbers dice

Nowadays, a number of government-run and private lotteries and lottery games are using software RNGs to pick a number instead of more traditional drawing methods. RNGs are also used to determine the outcomes of all modern slot machines. For some other modern applications, see How Random Numbers Are the Driving Force Behind Video Games, Jury Selection, and More .

Finally, random numbers are also useful in statistics and simulations. In statistical applications one often needs to draw numbers randomly from distributions different than the uniform, e.g. a normal distribution, binomial distribution, power distribution, pareto distribution... For such use-cases a more sophisticated software is required to perform the draw.

    Generating a random number

There is a philosophical question about what exactly "random" is , but its defining characteristic is surely unpredictability . We cannot talk about the unpredictability of a single number, since that number is just what it is, but we can talk about the unpredictability of a series of numbers (number sequence). If a sequence of numbers is random, then you should not be able to predict the next number in the sequence while knowing any part of the sequence so far. Examples for this are found in rolling a fair dice, spinning a well-balanced roulette wheel, drawing balls from a sphere, and the classic flip of a coin . No matter how many dice rolls, coin flips, roulette spins or lottery draws you observe, you do not improve your chances of guessing the next number in the sequence. For those interested in physics the classic example of random movement is the Browning motion of gas or fluid particles.

Given the above and knowing that computers are fully deterministic, meaning that their output is completely determined by their input, one might say that we cannot generate a random number with a computer. However, one will only partially be correct, since a dice roll or a coin flip is also deterministic, if you know the state of the system.

The randomness in our number generator comes from physical processes - our server gathers environmental noise from device drivers and other sources into an entropy pool , from which random numbers are created [1] .

According to Alzhrani & Aljaedi [2] there are four sources of randomness that are used in the seeding of a generator of random numbers, two of which are used in our number picker:

  • Entropy from the disk when the drivers call it - gathering seek time of block layer request events.
  • Interrupt events from USB and other device drivers
  • System values such as MAC addresses, serial numbers and Real Time Clock - used only to initialize the input pool, mostly on embedded systems.
  • Entropy from input hardware - mouse and keyboard actions (not used)

This puts the RNG we use in this randomizer in compliance with the recommendations of RFC 4086 on randomness required for security [3] .

    True random versus pseudo random number generators

A pseudo-random number generator (PRNG) is a finite state machine with an initial value called the seed [4] . Upon each request to draw a number at random, a transaction function computes the next internal state and an output function produces the actual number based on the state. A PRNG deterministically produces a periodic sequence of values that depends only on the initial seed given. An example would be a linear congruential generator like PM88. Thus, knowing even a short sequence of generated values it is possible to figure out the seed that was used and thus - know the next value the number randomizer will generate.

A cryptographic pseudo-random number generator (CPRNG) is a PRNG in that it is predictable if the internal state is known. However, assuming the generator was seeded with sufficient entropy and the algorithms have the needed properties, such generators will not quickly reveal significant amounts of their internal state, meaning that you would need a huge amount of output before you can mount a successful attack on them. Randomizers of this type are suitable if the number drawing generator is to be used in a high stakes situation.

A hardware RNG is based on an unpredictable physical phenomenon, referred to as "entropy source" . Radioactive decay , or more precisely the points in time at which a radioactive source decays is a phenomenon as close to randomness as we know, while decaying particles are easy to detect. Another example is heat variation - some Intel CPUs have a detector for thermal noise in the silicon of the chip that outputs random numbers.

Hardware RNGs are, however, often biased and, more importantly, limited in their capacity to generate sufficient entropy in practical spans of time, due to the low variability of the natural phenomenon sampled. Thus, another type of RNG is needed for practical applications: a true random number generator (TRNG). In it cascades of hardware RNGs (entropy harvester) are used to periodically reseed a PRNG. When the entropy is sufficient, it behaves as a TRNG. This is the type of process used to generate random numbers in this tool.

    References

1 Linux manual page on "urandom"

2 Alzhrani K., Aljaedi A. (2015) "Windows and Linux Random Number Generation Process: A Comparative Analysis", International Journal of Computer Applications 113:21

3 Schiller J., Crocker S. (2005) "IETF RFC 4086 - Randomness Requirements for Security"

4 Goichon F., Lauradoux C., Salagnac G., Vuillemin T. (2012) "A study of entropy transfers in the Linux Random Number Generator", research report 8060

Cite this calculator & page

If you'd like to cite this online calculator resource and information as provided on the page, you can use the following citation: Georgiev G.Z., "Random Number Generator" , [online] Available at: https://www.gigacalculator.com/calculators/random-number-generator.php URL [Accessed Date: 25 Feb, 2024].

     Statistical calculators

Random Numbers:

Random number generator.

Its the core of all randomness. Pick a number or generate a whole sequence of numbers within a minimum and maximum value (inclusive) while including or suppress duplicates. Your device is used to quickly generate these numbers, completely random and unique to you every time.

Change the quantity to one if you just want it to pick a number.

You can switch the presentation to roll some dice instead. Or change gears completely with the phone number generator or random letter generator .

Random Number Generator

This version of the generator creates a random integer. It can deal with very large integers up to a few thousand digits.

Comprehensive Version

This version of the generator can create one or many random integers or decimals. It can deal with very large numbers with up to 999 digits of precision.

A random number is a number chosen from a pool of limited or unlimited numbers that has no discernible pattern for prediction. The pool of numbers is almost always independent from each other. However, the pool of numbers may follow a specific distribution. For example, the height of the students in a school tends to follow a normal distribution around the median height. If the height of a student is picked at random, the picked number has a higher chance to be closer to the median height than being classified as very tall or very short. The random number generators above assume that the numbers generated are independent of each other, and will be evenly spread across the whole range of possible values.

A random number generator, like the ones above, is a device that can generate one or many random numbers within a defined scope. Random number generators can be hardware based or pseudo-random number generators. Hardware based random-number generators can involve the use of a dice, a coin for flipping, or many other devices.

A pseudo-random number generator is an algorithm for generating a sequence of numbers whose properties approximate the properties of sequences of random numbers. Computer based random number generators are almost always pseudo-random number generators. Yet, the numbers generated by pseudo-random number generators are not truly random. Likewise, our generators above are also pseudo-random number generators. The random numbers generated are sufficient for most applications yet they should not be used for cryptographic purposes. True random numbers are based on physical phenomena such as atmospheric noise, thermal noise, and other quantum phenomena. Methods that generate true random numbers also involve compensating for potential biases caused by the measurement process.

  • Ablebits blog
  • Random data

How to generate random numbers in Excel without duplicates

Svetlana Cheusheva

In this article, we'll discuss a few different formulas to randomize in Excel without repeating numbers. Also, we will show you a universal Random Generator that can produce a list of random numbers, dates, and strings with no repeats.

As you probably know, Microsoft Excel has several functions for generating random numbers such as RAND , RANDBETWEEN and RANDARRAY . However, there is no guarantee that the result of any function will be duplicate free.

This tutorial explains a few formulas for creating a list of unique random numbers. Please pay attention that some formulas only work in the latest version of Excel 365 and 2021 while others can be used in any version of Excel 2019, Excel 2016, Excel 2013 and earlier.

Get a list of unique random numbers with predefined step

Only works in Excel 365 and Excel 2021 that support dynamic arrays.

If you have the latest Excel version, the easiest way for you to get a list of unique random numbers is to combine 3 new dynamic array functions: SORTBY, SEQUENCE and RANDARRAY:

Where n is the number of random values you want to get.

For example, to create a list of 5 random numbers, use 5 for n :

=SORTBY(SEQUENCE(5), RANDARRAY(5))

Enter the formula in the topmost cell, press the Enter key, and the results will spill automatically over the specified number of cells.

Simple formula to produce a list of unique random numbers with predefined step

In the above formula, you only define how many rows to fill. All other arguments are left to their default values, meaning the list will start at 1 and will be incremented by 1. If you'd like a different first number and increment, then set your own values for the 3 rd ( start ) and 4 th ( step ) arguments of the SEQUENCE function.

For instance, to start at 100 and increment by 10, use this formula:

How this formula works:

Working from the inside out, here's what the formula does:

  • The SEQUENCE function creates an array of sequential numbers based on the specified or default start value and incrementing step size. This sequence goes to the array argument of SORTBY.
  • The RANDARRAY function creates an array of random numbers of the same size as the sequence (5 rows, 1 column in our case). The min and max value do not really matter, so we can leave these to defaults. This array goes to the by_array argument of SORTBY.
  • The SORTBY function sorts the sequential numbers generated by SEQUENCE using an array of random numbers produced by RANDARRAY.

Generate a list of random numbers with no duplicates

To generate random numbers in Excel without duplicates, use one of the below generic formulas.

Random integers :

Random decimals :

  • N is the number of values to generate.
  • Min is the minimal value.
  • Max is the maximum value.

For example, to create a list of 5 random integers from 1 to 100 with no repeats, use this formula:

To generate 5 unique random decimal numbers , put FALSE in the last argument of RANDARRAY or omit this argument:

At first sight the formula may look a bit tricky, but upon a closer look its logic is very straightforward:

  • The RANDARRAY function creates an array of random numbers based on the min and max values that you specify. To determine how many values to generate, you raise the desired number of uniques to the power of 2. Because the resulting array may have no one knows how many duplicates, you need to provide a sufficient array of values for UNIQUE to choose from. In this example, we need only 5 unique random numbers but we instruct RANDARRAY to produce 25 (5^2).
  • The UNIQUE function removes all duplicates and "feeds" a duplicate-free array to INDEX.
  • From the array passed by UNIQUE, the INDEX function extracts the first n values as specified by SEQUENCE (5 numbers in our case). Because values are already in random order, it does not really matter which ones survive.

Note. On very large arrays, this formula may be a bit slow. For example, to get a list of 1,000 unique numbers as the final result, RANDARRAY would have to generate of array of 1,000,000 random numbers (1000^2) internally. In such situations, instead of raising to power, you can multiply n by, say, 10 or 20. Just keep in mind please that the smaller array is passed to the UNIQUE function (small relative to the desired number of unique random values), the bigger the chance that not all cells in the spill range will be filled with the results.

Create a range of non-repeating random numbers in Excel

To generate a range of random numbers with no repeats, you can use this formula:

  • n is the number of cells to fill. To avoid manual calculations, you can supply it as (no. of rows * no. of columns). For example, to fill 10 rows and 5 columns, use 50^2 or (10*5)^2.
  • Rows is the number of rows to fill.
  • Columns is the number of columns to fill.
  • Min is the lowest value.
  • Max is the highest value.

As you may notice, the formula is basically the same as in the previous example. The only difference is the SEQUENCE function, which in this case defines both the number of rows and columns.

For instance, to fill a range of 10 rows and 3 columns with unique random numbers from 1 to 100, use this formula:

=INDEX(UNIQUE(RANDARRAY(30^2, 1, 1, 100)), SEQUENCE(10, 3))

If you need whole numbers, then set the last argument of RANDARRAY to TRUE:

How to generate unique random numbers in Excel 2019, 2016 and earlier

As no version other than Excel 365 and 2021 supports dynamic arrays, none of the above solutions work in earlier versions of Excel. However, this does not mean there is no solution at all, you'll just have to perform a few more steps:

  • The RAND function to generate random decimals between 0 and 1, or
  • The RANDBETWEEN function to produce random integers in the range that you specify.

Be sure to generate more values than you actually need because some will be duplicates and you'll delete them later.

For this example, we are creating a list of 10 random integers between 1 and 20 by using the below formula:

=RANDBETWEEN(1,20)

To enter the formula in multiple cells in one go, select all the cells (A2:A15 in our example), type the formula in the formula bar and press Ctrl + Enter . Or you can enter the formula in the first cell as usual, and then drag it down to as many cells as needed.

Done! All duplicates are gone, and you can now delete the excess numbers.

Tip. Instead of Excel's built-in tool, you can use our advanced Duplicate Remover for Excel .

How to stop random numbers from changing

All of the randomizing functions in Excel including RAND, RANDBETWEEN and RANDARRAY are volatile, meaning they recalculate every time the spreadsheet is changed. As the result, new random values are produced with every change. To prevent generating new numbers automatically, use the Paste Special > Values feature to replace formulas with static values. Here's how:

  • Select all the cells with your random formula and press Ctrl + C to copy them.
  • Right click the selected range and click Paste Special > Values . Alternatively, you can press Shift + F10 and then V , which is the shortcut for this option.

Random number generator for Excel with no repeats

The users of our Ultimate Suite do not really need any of the above solutions because they already have a universal Random Generator in their Excel. This tool can easily produce a list of non-repeating integers, decimals numbers, dates, and unique passwords. Here's how:

  • On the Ablebits Tools tab, click Randomize > Random Generator .
  • Select the range to fill with random numbers.
  • Choose the desired value type: integer, real number, date, Boolean, custom list, or string (ideal for generating strong unique passwords!).
  • Set up the From and To values.
  • Select the Unique values check box.
  • Click Generate .

Random number generator for Excel with no repeats

That's how to randomize numbers in Excel without duplicates. I thank you for reading and hope to see you on our blog next week!

Practice workbook for download

You may also be interested in.

  • How to select random sample in Excel
  • How to sort randomly in Excel
  • How to create a sequence of dates in Excel
  • How to prevent duplicates in column in Excel

Table of contents

Ablebits.com website logo

35 comments

random number generator that doesn't repeat

I have tried to apply this formula =INDEX(UNIQUE(RANDARRAY(120^2, 1, 1, 50, TRUE)), SEQUENCE(15,8)) to get 15 rows * 8 columns of numbers 1 to 50 with no repeats in the rows. The formula works for like 5 or 6 rows correctly and then the #REF! error populates the other cells down.

Also, would it be possible to wrap this formula with a sortby function such that instead of the result reading as (eg. 38,15,16,4,12,46,43,48), I get the same values but sorted like this (4,12,15,16,38,43,46,48)

Please and Thanks,

random number generator that doesn't repeat

Hi! You want to write 50 numbers in 120 cells without repeating them? Sorry, that is not possible. Increase the quantity of numbers. For example,

=INDEX(UNIQUE(RANDARRAY(120^2, 1, 1, 500, TRUE)), SEQUENCE(15,8))

Wow, that was quick. Thanks Alexander.

My apologies. Here is a better example of what happens S.No. 1 - 11,18,24,27,29,40,42,50 2 - 1,6,8,19,23,26,46,47 3 - 3,9,13,14,25,28,34,39 4 - 4,5,10,20,32,35,37,41 5 - 7,12,16,30,33,36,43,45 6 - 2,15,17,22,38,44,48,49 7 - 21,31,#REF!,#REF!,#REF!,#REF!,#REF!,#REF! 8 - #REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF! 9 - #REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!

Did you use the formula I gave you?

i am in need of values from 1 to 50. replacing 50 with 500 does remove the #Ref! errors but does not help as the numbers are above 50.

Then find a way to place 50 numbers in 120 cells without repeating them. I think this will be very much appreciated.

random number generator that doesn't repeat

That's perfect! Thank you very much, Svetlana!

random number generator that doesn't repeat

I 'm using VBA with randombetween function and I think it is the best way to generate unique random numbers (as example range of random numbers between 100 to 1000) . The VBA code check the current generated number with all previous numbers if exist then it must be regenerated again and so on.

random number generator that doesn't repeat

I have a random generator file for choosing swabbing sites. Once a year we need to go through all the sites, and we swab weekly. How can I format the file so that it does not ever duplicate a swab site for the year? Is this possible? We are randomly picking 7 sites weekly, but I don't want it to duplicate till all the sites have been swabbed, and then it could start over.

The equation I'm currently using is: =INDEX(UNIQUE(RANDARRAY(7^2,1,1,312,TRUE)),SEQUENCE(7))

I could randomize all 312 sites, just wondering if there is a better way to accomplish the task. Multiple people use the file, so I want something user friendly for everyone using it.

Is this possible to do in Excel?

Hello! Random values can only be generated over a continuous range of numbers. You can check the site check box in a separate column. Then you create a new list of unverified sites. Change the number 312 in the formula to a smaller one.

random number generator that doesn't repeat

Hi There- I Loved these formulas!! It was super helpful, though I am trying to see if there is a related formula (or pair of them) for allowing 'less than e.g. 10% repeat rates. For example, if we started with 1500 product testers, and we had 100 testers per product, how could we generate groups of 100 per product such that no more than 10% of the 100 were repeats (i.e. groups of 100 were 90% unique). Thanks in advance for your insight! Best Regards, JF

Hello! Unfortunately, Excel formulas cannot control how many duplicates will appear in the list.

random number generator that doesn't repeat

Hello! I am using this formula but need two columns of random numbers. 1-9 are the numbers. If first column number is 1-5 then second column needs to be greater than 5 and vica versa, if first column is >5 then second column 5 =<. I was thinking I’d have to imbed another formula into a if then? I’m pretty rusty with excel.

Hello! Sorry, I do not fully understand the task. What formula are you using? Write an example of the result you want to get.

Thanks for the reply! So I’m assigning daily schedules to 9 employees for Morning and afternoon. 9 schedules, 9 employees. I used =sortby(sequence(9),randarray(9)) to assign the AM schedules. For PM, anyone with a schedule 1-5 in AM should be assigned schedules 6-9 and if 6-9 in am, 1-5 in afternoon. I did a combination of IF and randbetween but of course get duplicates in afternoon

So far I need this to not have duplicates: =if(b12<=5,randbetween(6,9),randbetween1,4))

Hi! Write an example of what values you want to see in column B and column C. I think that for 5 people (1-5) it is impossible to assign 4 numbers (6-9) without duplicates! Or have I misunderstood something?

B. C 5. 7 3. 6 7. 4 4. 5 8. 1 6. 2 2. 3 1. 9

Hopefully formatting will hold when I post this.

Correction. That 9 in C column can be an 8. This example has 8 employees and 8 schedules. Different days have different numbers of employees available for schedules.

Hi! As far as I can see from your last comment, your task is now different from the original one. Your example result is completely different from what you wrote earlier. In these numbers, I do not see any pattern. I don’t think I can help with such a task.

random number generator that doesn't repeat

I am also having a problem with the formula:

=INDEX(UNIQUE(RANDARRAY(4, 10, 1, 10, TRUE)), SEQUENCE(4), {1,2,3,4,5,6,7,8,9,10}).

I am basically trying to produce a Sudoku table much like the example above with the tennis players.

I want to have 4 inspectors test 10 parts with them testing at the same time (if part 1 is being tested by inspector 1, it cannot be available to the other 3 inspectors during that run and inspector 1 should only be shown part 1 one time).

The array should only produce 1 number across a row and column.

Hi! The information you provided is not enough to understand your case and give you any advice, sorry. Describe in detail what problem you have, and I will try to help you.

random number generator that doesn't repeat

thanks for your blog. I have volunteered to build a tennis schedule for my club, this requires random teams of 4 for each of 4 time slot (total 16 per week). Unfortunately there are 20 players, so 4 'sit out' each week. E.G. week 1, players 1-16 play, (these are to be randomized) and players 17-20 'sit out'. In week 2 perhaps players 5-20 play and 1-4 'sit out'. Each number has a name associated with it. I tried this formula across my players both in and out =INDEX(UNIQUE(RANDARRAY(30^2,1,1,20,TRUE)),SEQUENCE(1,20)) but the 'out' players were treated like any other group of 4 and so they were not fairly randomized (they should only sit out 2 times in an 8 week rotation. I was wondering if there is a way to input a dynamic range so that each week it can look at my non randomized list of players who are out for a week and generate the random numbers from the residual list of 1-20 for my list of players :)

random number generator that doesn't repeat

Any update to Richard's challenge up above? I'm in the same boat having volunteered to build a Pickleball schedule for my club and facing the same challenge

Hi! Your request goes beyond the advice we provide on this blog. This is a complex solution that cannot be found with a single formula. If you have a specific question about the operation of a function or formula, I will try to answer it.

random number generator that doesn't repeat

Hello, thanks for this interesting topic. I wondered to know how to generate unrepeated random number starting always by the same number, like 12 for exemple?

Hi, The formula below will do the trick for you:

=--("12"&RANDBETWEEN(100,200))

I hope my advice will help you solve your task.

random number generator that doesn't repeat

PREZADA EXISTE UMA FORMULA EM EXCEL PARA GERAR NUMEROS ALEOTÓRIOS EXCLUINDO ALGUNS. EX GERA RANDOM ENTRE 1 E 30 EXCLUINDO OS NUMEROS 11,24 E 29

random number generator that doesn't repeat

Hi, I have a query regarding the following function:

=INDEX(UNIQUE(RANDARRAY(20, 3, 1, 100, TRUE)), SEQUENCE(10), {1,2,3})

You have provided this formula under the heading "Create a range of non-repeating random numbers in Excel". But the example array you have shown contains repeating numbers. Eg: 65 appears twice, 25 apears twice, 61 appears twice and so on. Your array does not appear to contain 30 unique random numbers, because several of them are repeated.

I am trying to create a 5 x 5 array, with randomly generated numbers between 1 and 50, without any duplicates. So the result I need is 25 unique numbers in the range 1 to 50, in a 5 x 5 table. This is my formula based on your example:

=INDEX(UNIQUE(RANDARRAY(50, 5, 1, 50, TRUE)), SEQUENCE(5), {1,2,3,4,5})

But I am yet to get a 5 x 5 array with 25 unique numbers. There are always several numbers that are repeated in the array, sometimes in duplicate, sometimes even in triplicate. I thought at first, maybe my range (1 to 50) is not big enough? So I extended it from 1 to 100, but still got repeating numbers.

In any case, I thought the UNIQUE function would weed out any duplicated numbers. So really, it shouldn't matter whether I have 1 to 50 or even 1 to 500 as my range, isn't the job of "UNIQUE" to stop two numbers that are the same from ending up in the array?

My question is: how can I get my 5 x 5 array to have 25 unique numbers with values between 1 and 50 without any duplication of numbers?

I am using the latest 365 version of Excel.

Thank you for any assistance you can offer.

random number generator that doesn't repeat

The formula is incorrect, sorry for misleading you. Trying it figure it out now (and how I could have overlooked duplicate numbers in the screen). We will post an update asap. Again, my apologies for the inconvenience.

We have fixed the formula and updated the example (thanks to Alex , one of our best Excel gurus, for this solution!).

During my tests, the improved formula worked perfect with no repeats. We will appreciate if you could test it on your side too and let us know about your results. Thank you in advance!

random number generator that doesn't repeat

In my question/comment, I meant to say that I'm interested in generating unique random numbers across rather than down.

Dear Dr. Rapoport,

If you use Excel 365, then you can find a solution in How to create a range of unique random numbers . That formula produces no duplicates in either rows or columns.

Generate random numbers without Ablebits works down columns. It does not seem to work across rows, because if I produce an array using any of these methods, there are often duplicates in a row. Is there a way to fix that? Thanks.

Hello! There are a lot of formulas in the article. Clarify which of them are you talking about? Try this formula

=INDEX(UNIQUE(RANDARRAY(2, 10, 1, 100)), SEQUENCE(1), {1,2,3,4,5,6,7,8,9,10})

Post a comment

Happy Cat Tools

random number generator no repeat

If you need a list of unique numbers you can use this free random number generator no repeat tool. Use a list random numbers with no duplicates for games or puzzles, or to see who goes first in an activity.

Random number generators are used in scientific research to generate random numbers, generate pseudorandom numbers and seed pseudorandom number generators. This tool generates a random number without repeating any numbers.

A unique random number generator is great for games of chance. Some of the most popular games include roulette, blackjack, and poker. It is good for picking a certain number of winners when you have issued lottery tickets for a school or church function.

Generate unique random numbers

Click the button below to get started to get a list of random numbers with no repeats. You can give a minimum and maximum range for the numbers, and set how many numbers you’d like to get back.

For example, you can generate 10 numbers between 1 and 50, or 200 numbers between 10 and 10000. Then you can get your list of random numbers from the random number generator no repeat allowed!

Random number generator no repeates

Random Questions about Random number generators

What is a random number.

A random number is a number that is selected from a given range of numbers at random. It can be used in many fields such as games, simulations, and computer science.

What is a random number generator no repeats?

This is a generator that will give a random number table or a list of unique random numbers which you can use in games, projects, or anything else you want to do. It will not give the same number twice in the list.

How can random number generator pick things besides numbers?

By giving a number to each item on a list. For example given the list:

The computer will chose a number between 1 and 3. If it picks a 2, it will give you the word cat. This is how our random word lists work. Phone number generators just need to pick numbers 0 to 9, 10 different times to make a fake phone number.

Random numbers are used to model random processes such as dice rolls, coin flips, and the lottery. The process of picking a number at random is based on chance and is not predictable. It can be determined by using a random number generator tool or by rolling a fair die.

Many methods and apps exist to pick random numbers, and all of them vary in popularity. Some are more old-fashioned, while others are more modern. Some are not always the most efficient way for picking a number. Spinning a wheel, picking floating balls from the air, or picking numbers out of a hat are other popular ways people have picked random numbers before computers.

How random are the numbers?

There is no such thing as a truly random number. xComputers can only generate random numbers if they are programmed to do so, and humans can only generate random numbers through a process known as linear congruential pseudorandom number generator. Event Google random number generators work this way. However for most purposes such as games, these numbers will serve the purpose of a random number.

To learn more about how these tools work you can read an in-depth study here.

Features of this random number generator:

  • Generate sequence using a loop
  • Speed loop that lets you control the speed of random generation
  • History of generated numbers for both the sequence and the loop
  • Copy numbers to clipboard
  • Delete or Copy History
  • Create favorite random number generators
  • Remembers recently used random number generators
  • Remembers last generated number
  • Use Seed for a Seeded RNG to generate the same sequence again
  • Reset Seed per session or remember the seed for longer
  • Option to allow numbers to repeat in the loop or the sequence
  • Notifies when all numbers in the sequence are generated
  • Auto-stop loop when it has looped through the range of numbers
  • Exclude specific numbers from the list
  • Select odd, even or half for games
  • Show total sum of the random numbers
  • Specific shortcuts for single digit ranges, pin codes, lottery, dice and coins
  • Lucky touch screen that allows you to select lucky numbers using your touch
  • Multiple screens for easy access of presets

Random Number Generator App in Playstore

Get it on Google Play

TechRepublic

Account information.

random number generator that doesn't repeat

Share with Your Friends

How to generate random numbers with no duplicates in Excel

Your email has been sent

Image of Susan Harkins

Image: PixieMe/Shutterstock

Over the last few months, I’ve written about several of Excel’s new dynamic array functions. They’re powerful and easy to implement—relieving us of some very tiresome expression-building that was necessary before. In this article, we’ll combine a few of these new dynamic array functions to generate an array of unique random values. It’s easy to generate random values; it’s just as easy to limit the bottom and top boundaries for a set of random values. What isn’t so easy, as you’ll see, is generating an array of unique random values. Fortunately, using dynamic array functions, you only have to jump through a few hoops.

SEE: 83 Excel tips every user should master (TechRepublic)

I’m using Microsoft 365 on a Windows 10 64-bit system. Dynamic array functions are supported by 365, Excel for the Web, Excel 2021, Excel for iPad and iPhone, Excel for Android tablets and phones. There’s no demonstration file; you won’t need one.

About random functions

Excel has three random value functions: RAND(), RANDBETWEEN(), and RANDARRAY(). RAND() generates random values between 0 and 1, so random decimal values. RANDBETWEEN() lets you specify the bottom and top values. For instance, you might use RANDBETWEEN(10,1000) to generate random integers between 10 and 1,000.

Finally, RANDARRAY() returns an array of random values using the following syntax: RANDARRAY([rows], [columns], [min], [max], [integer]) Notice that all of the arguments are optional. These arguments allow you to specify the number of rows and columns to fill, the minimum and maximum values to return, and whether to return integers or decimals. The integer argument is false by default, which returns decimal values. To return integers, you must specify TRUE. In addition, min and max are inclusive values. For example, if these two arguments are 1 and 5, respectively, the function will return 1, 2, 3, 4 and 5, not just 2, 3 and 4.

When considering arguments, keep the following rules in mind:

  • RANDARRAY() performs like RAND(), returning a value between 0 and 1 if you omit all arguments.
  • RANDARRAY() performs like RAND(), returning a value between 0 and 1 if you omit rows and columns.
  • RANDARRAY() will return 0 or 1 respectively, if you omit min and max.
  • The min argument must be less than max.
  • RANDARRAY() will include decimal values if you don’t explicitly set integer to TRUE.
  • RANDARRAY() will create the appropriate-sized range to complete the calculations. This range is called the spill range . If there aren’t adequate cells in this range, RANDARRAY() returns a spill error. To learn more about Excel’s spill range, you can read How to use the spill range in Excel
  • RANDARRAY() will update results and resize when the source data changes if the source data is in a Table object.
  • Currently, if the data source is in another workbook, both workbooks must be open for RANDARRAY() to function properly.
  • To generate a random array of non-duplicate values, we’ll use three dynamic array functions: RANDARRAY(), UNIQUE(), and SEQUENCE().

How to generate random values without duplicates, sort of

RANDARRAY() alone has the potential to return duplicate values, as do all the random functions. If you have the time, there’s a simple way to achieve random values with no duplicates. Convert the values in the spill range to static values (also replacing the function) and then remove any duplicates using the Remove Duplicates tool on the Data tab. It is easy, but it isn’t a reasonable way to work unless what you’re doing is a one-time pass.

You can’t force RANDARRAY() to return only unique values, but you can combine it with UNIQUE() to get the desired results. For instance, the following function, shown in Figure A , will return a single column of five (seemingly) unique values between 1 and 20:

=UNIQUE(RANDARRAY(5, 1, 1, 20,TRUE))

Two things might happen though: 1.) You see a list of random unique values that is less than you specified; 2.) You see a spill error (to the right in Figure A ).

When RANDARRAY() repeats enough values that the expression can’t return five unique values from RANDARRAY()’s pool of random values, it will return what it can—which might be short a value or two. The chances of having so many repeating values in that pool of 20 (the min and max values of 1 and 20, respectively) that you can’t return a list of five is small, but not impossible. Press F9 and watch the expression update; eventually you will see an array that is less than five digits.

The shot on the right ( Figure A ) shows the expression in the formula bar where I’ve manually calculated RANDARRAY() by selecting only that function and pressing F9. As you can see, the array does repeat a value, the value 1. Hence, the expression can return only four unique values.

random number generator that doesn't repeat

Figure B shows a spill error, spill range unknown . I’ve changed the rows argument from 5 to 19 forcing that to happen more often, but if you press F9 often enough, the rows argument of 5 will eventually return a spill error. It has to do with the volatile nature of these functions—sometimes one calculates faster than the other. A volatile function recalculates every time a change is made.

random number generator that doesn't repeat

One way to ensure that the expression doesn’t return fewer values than specified is to create a huge pool of random values. Perhaps the easiest way is to change the rows argument from a specific value to a short expression: n ^2. For example,

=UNIQUE(RANDARRAY(5^2, 1, 1, 20,TRUE))

The row expression, 5^2, will return 25 random values, but now the expression returns up to 25 values (rows) and you’re still susceptible to an occasional spill range error. However, it’s unlikely to return fewer than five rows.

If you can live with all these behaviors, you could stop here. Chances are, though, that you’ll want something more stable.

How to generate random values without duplicates

In the last section, you learned a lot about RANDARRAY() and UNIQUE() and how they work together, even though the results aren’t stable. Your needs will determine whether you need to take this problem to the next level.

Right now, we have an expression that doesn’t always return the right number of values and has the potential to return a spill error. To avoid these two problems, you need a more complex expression in the form

=INDEX(UNIQUE(RANDARRAY(rows^2, columns, min, max, TRUE)), SEQUENCE(rows))

It looks horrible, but don’t worry. Once you understand how it works, it will make good sense, and you’ll have little trouble applying it to your own work.

RANDARRAY() generates an array of random values based on min and max. The rows argument to the power of 2 generates a large pool of random values—much larger than just the rows value itself. UNIQUE() removes all duplicate values and returns an array of unique values. We got this far in the last section.

The difference this time, is that UNIQUE() doesn’t return the array to the sheet. Once UNIQUE() removes duplicates, INDEX() uses the number of rows expressed in SEQUENCE() to determine how many unique random values to return as an array to the sheet.

Figure C shows this expression using our earlier argument values:

=INDEX(UNIQUE(RANDARRAY(5^2,1,1,10,TRUE)), SEQUENCE(5))

First, RANDARRAY() returns a single-column array of 25 random integers between 1 and 10. UNIQUE() removes all the duplicates from those results. INDEX() then returns the top five unique and random values, as determined by SEQUENCE(5).

random number generator that doesn't repeat

Keep in mind that min and max still matter. For instance, if min and max are 1 and 5, respectively, you can’t return an array of 10 values—there aren’t that many unique values between 1 and 5. The expression will return five unique values, but the remaining cells in the spill range will display errors. That’s an over-simplification, but it makes the point.

In addition, large arrays take time. Consider a rows value of 2000^2. Internally, Excel is calculating 4,000,000 random numbers! You probably don’t need that large of a pool. Instead, multiply the rows argument by another value, such as 10. That returns 20,000 random values, which might be enough, dependent on the min and max values.

You’ll have to experiment to determine whether a pool is large enough. There’s no true silver bullet because of the relationship: the chance or returning an incomplete spill range increases as the number of random numbers passed to UNIQUE() decreases.

It’s confession time. This is a creative and powerful expression that takes advantage of Excel’s newer dynamic array functions. I’d like to claim full credit for designing this expression, but it has been around the internet now for a while. If I could credit the creative genius who came up with it the first time, I would.

To learn more about dynamic array functions, read the following articles:

  • How to use the newish XLOOKUP() dynamic array function in Excel
  • How to generate random text using the RANDARRAY() function in Excel
  • How to use the FILTER() dynamic array function in Excel
  • How to use the spill range in Excel

Subscribe to the Developer Insider Newsletter

From the hottest programming languages to commentary on the Linux OS, get the developer and open source news and tips you need to know. Delivered Tuesdays and Thursdays

  • How to add a prefix to a numbered list in a Word document
  • How to display an alert when Outlook email from a specific address arrives
  • Cyberattack threat: Corporate users infected via Microsoft Teams
  • Checklist: Securing Windows 10 systems
  • More must-read Microsoft coverage

Image of Susan Harkins

Create a TechRepublic Account

Get the web's best business technology news, tutorials, reviews, trends, and analysis—in your inbox. Let's start with the basics.

* - indicates required fields

Sign in to TechRepublic

Lost your password? Request a new password

Reset Password

Please enter your email adress. You will receive an email message with instructions on how to reset your password.

Check your email for a password reset link. If you didn't receive an email don't forgot to check your spam folder, otherwise contact support .

Welcome. Tell us a little bit about you.

This will help us provide you with customized content.

Want to receive more TechRepublic news?

You're all set.

Thanks for signing up! Keep an eye out for a confirmation email from our team. To ensure any newsletters you subscribed to hit your inbox, make sure to add [email protected] to your contacts list.

How to make Math.random not repeat same numbers

Hi! I was trying to make an app and I need to make it show 4 random items from an array but the problem is that with Math.random there’s a possibility to have the same item twice or more times. Does anyone know how to solve this?

I would approach this by creating a variable to hold the previously generated value, comparing the current value, and if they are the same regenerate.

I have added an example for you. I think what you are interested in is the haveIt array, the !haveIt.includes(value) line and the recursive call.

:slight_smile:

I assume you don’t want to repeat until you’ve exhausted the array.

There is also a secondary issue that you may/may not care about, that once the array is exhausted, the next value pulled out could repeat the latest value of the previous sequence.

So what you need is a random generator with state: it has to know which values are allowed from a pool of values, it needs to consume that pool, and it needs to store the last value from the pool when the sequence restarts with a full pool.

@nhcarrigan suggestion covers second issue. @GeorgeCrisan suggestion covers first issue (although it uses a global variable and recursion, both of which you probably want to avoid)

What is the context here? It would be helpful to kow that as it dictates tye solution somewhat

simplest way is to remove the used items from array then no way they can be repeated

I think the function I wrote does cover the first issue too. The scope is not really in the context of the problem. Why would you want to avoid recursion when you understand what you are doing?

Eventually, I came up with my own solution but still managed to mess it up so it doesn’t go random anymore but anyways, here’s what I wanted to make

JS isn’t particularly good at recursion (not optimised by the language) and recursive code is normally more difficult to read, so rule of thumb is generally avoid unless it’s necessary. In this case it’s quite elegant but unecessary. That’s why I asked op for the context as well

I agree that sometimes there are more than one way of doing same thing.

Simplest way is to shuffle the array then take four values from it. This is the Durstenfeld shuffle algorithm (note that it modifies the array), it’s basically just taken straight from Wikipedia:

If you want four random values then just shuffleArray(myArr).slice(0, 4)

If you want n values without shuffling (this modifies the original array)

If you don’t want to modify the original array, then pass a copy of it to the above function

[This is way beyond what’s required, but may/may not be of interest]

To make it fancy, this is where it gets a little more complex. I’ll use the shuffleArray function from above. To spit out an infinite number of non-repeating values:

The star on the function keyword ( function* ) means it’s a generator . That’s used like:

Then I can ask for the next value, forever.

Which can be encapsulated:

I use this like this. Initialise it:

Then use it:

This is sample output:

I want to have the option of getting a collection of random values at once. I’ll call it a sample. I can integrate this in without closing the generation of numbers – I can ask for sequences of any length and the generator will keep cycling through and shuffling the array to make sure I don’t get repeats:

I initialise it exactly the same way, then ask for values like this:

Note that I’m now getting an array of values halfway through. It still won’t repeat array values until it switches onto starting the cycle again. This is sample output:

The 2 then the [2, 1, 3, 4] , there’s a repeat (goes 2 then 2). This can be fixed [a bit shoddily] by adjusting the generator to store the last value from the previous cycle and just shuffling until the first value in the new cycle isn’t the same

That could end up shuffling the array a load more times than is necessary, so simpler would be to just switch the first two values in the new cycle:

Now the sequence will never spit out identical values consecutively.

All of this is made under the assumption that the original array has more than one value, so need to handle that case (array has no values or array has only one value).

Also this is impossible to test, so next step would be to replace Math.random() stuff with a seeded random number generator. What this means is that if I give it a “seed” value (could be anything), it will always return the same sequence. That lets me test it.

Also, minor, but I wouldn’t want the generator in the class to be accessible, so I’d make that private. And ideally I’d not want the constructor to be accessible either, so the API is just init , generate and sample , but would need some fiddling to prevent that.

Also, what the array contains and how big it’s likely to be are important – it may be better to generate random indices , rather than shuffling the array and pulling values out of the result – that would only need some minor modification though (I’d be going through a range of integers from 0 to array.length - 1), same principles apply.

As I say, this is purely done as a demonstration – I’ve needed to do this a few times, and this is generally a sane way to do things (lazy sequences).

Just hold the visited values in an object and check it at every iteration. You will be storing more data though.

Input: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 4 Output: [ 8, 5, 7, 4 ]

picks = [ 8 ], visited = { ‘7’: true } picks = [ 8, 5 ], visited = { ‘4’: true, ‘7’: true } picks = [ 8, 5, 7 ], visited = { ‘4’: true, ‘6’: true, ‘7’: true } picks = [ 8, 5, 7, 4 ], visited = { ‘3’: true, ‘4’: true, ‘6’: true, ‘7’: true }

:slightly_smiling_face:

As the visited array fills this approach will take longer and longer. I’m dubious that the solution is truly constant if you need a large number of values relative to the interval size.

You are right. The way I wrote it was misleading. I meant that the look-up part is constant. Obviously the whole function will take more because we are looping through the array. I will edit that.

My final solution using Set: @DanCouper Is there any other simpler, cleaner or more performant way to achieve this?

First parameter (limit - @int ) is the max of a random number can be. Second parameter (totalValues - @int ) is the quantity of random unique numbers.

“totalValues” has to be less than or equal “limit” (you can add a check inside of the function if you like).

101010

This function returns an array of unique random items first argument is the array of items second argument is the number of random items you wish to be returned the array passed to function is not altered

IMAGES

  1. Non Repeated Random Numbers Generator

    random number generator that doesn't repeat

  2. How To Generate Random Numbers That Don't Repeat In Xcode 8 (Swift 3)

    random number generator that doesn't repeat

  3. How to generate random number without duplicates in Excel?

    random number generator that doesn't repeat

  4. Random Number Generator in Excel with No Repeats (9 Methods)

    random number generator that doesn't repeat

  5. Random Numbers Generator without Repeat Numbers using VBA in Microsoft

    random number generator that doesn't repeat

  6. Random Numbers Generator without Repeat Numbers using VBA in Microsoft

    random number generator that doesn't repeat

VIDEO

  1. C# Random Number Generator

  2. Random Number Generator Picks My Makeup

  3. Is Numbers' random number generator random?

  4. Random number generator chooses how long I read

  5. Random number generator for SF row

  6. Random number lore

COMMENTS

  1. Random Number Generator

    Allow repeats? If you choose No your random numbers will be unique and there is no chance of getting a duplicate number. If you choose Yes the random number generator may produce a duplicate number in your set of numbers. Sort numbers? You can decide not to sort your random numbers.

  2. Non Repeated Random Numbers Generator

    Solvers Statistics Non Repeated Random Numbers Generator Instructions: Use this non-repeated random number generator to create a sequence of random numbers that are all different. Please provide the minimum and maximum values, and how many numbers you want to generate: Minimum Value (integer) = Maximum Value (integer) =

  3. RANDOM.ORG

    Random Sequence Generator This form allows you to generate randomized sequences of integers. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs. Part 1: Sequence Boundaries Smallest value (limit -1,000,000,000)

  4. Random Number Generator

    If you want to generate one random number, choose a number that will be the lower limit (the minimum value), and then pick a number that will be the upper limit (the maximum value). To generate again, click the arrow below the "Result" field.

  5. Random Number Generator

    Our number randomizer will pick a number from 1 through 10 at random. To generate a random number between 1 and 100, do the same, but with 100 in the second field of the picker. To simulate a dice roll, the range should be 1 to 6 for a standard six-sided dice. To perform the equivalent of a coin flip, set the range between 1 and 2 and the ...

  6. Random Numbers

    Random Number Generator. Its the core of all randomness. Pick a number or generate a whole sequence of numbers within a minimum and maximum value (inclusive) while including or suppress duplicates. Your device is used to quickly generate these numbers, completely random and unique to you every time. Change the quantity to one if you just want ...

  7. Create Random Number Sequence with No Repeats

    1 1 asked Mar 29, 2009 at 0:40 Unknown 46.2k 27 141 182 1 There are PRNGs that do not repeat until the entire cycle is over — any of them that use the last generated number as seed for the next have that property. - derobert Mar 29, 2009 at 0:55 1

  8. Random Number Generator

    Calculator.net offers two versions of a random number generator that can create integers or decimals within a range of numbers. The generator can deal with very large numbers up to 999 digits of precision, but it is not true random and should not be used for cryptographic purposes.

  9. How to generate random numbers in Excel with no repeats

    Learn how to create a list of unique random numbers in Excel using formulas, functions and a universal Random Generator. The web page explains different formulas for generating random numbers in Excel without duplicates, with predefined step, in a range or in a list of random numbers, dates and strings.

  10. Non-repeating Random Number Generator

    There are many occasions in which generating random numbers is helpful - computer games being a key example, statistical analysis, cryptography, and many others. The generation of each random number can often be considered a unique event. That is, it has no connection to past or future events.

  11. random number generator no repeat

    Bird The computer will chose a number between 1 and 3. If it picks a 2, it will give you the word cat. This is how our random word lists work. Phone number generators just need to pick numbers 0 to 9, 10 different times to make a fake phone number. Random numbers are used to model random processes such as dice rolls, coin flips, and the lottery.

  12. Best Random Number Generator

    Download the numbers or copy them to clipboard. Click on Start to engage the random number spinner. While spinning, you have three optons: 1) Press "Stop" to stop all the numbers 2) Press "One" to stop the numbers manually one by one, or 3) Press "Zoom" to let the spinner come to a stop slowly revealing all your numbers.

  13. Random Number Generator

    Create favorite random number generators. Remembers recently used random number generators. Remembers last generated number. Use Seed for a Seeded RNG to generate the same sequence again. Reset Seed per session or remember the seed for longer. Option to allow numbers to repeat in the loop or the sequence.

  14. How to generate random numbers with no duplicates in Excel

    RANDARRAY ( [rows], [columns], [min], [max], [integer]) Notice that all of the arguments are optional. These arguments allow you to specify the number of rows and columns to fill, the minimum and...

  15. How to Create a List of Random Numbers with No Duplicates or Repeats

    We can use the RANDBETWEEN function to create random numbers between a certain range, say 1 and 100, but there is nothing in the function to prevent duplicate numbers from being created in the range. Update January 20, 2020: We can now solve this with a formula using a few of the new Dynamic Array Functions, SORTBY, SEQUENCE, and RANDARRAY.

  16. RANDOM.ORG

    Lists and Strings and Maps, Oh My! List Randomizer will randomize a list of anything you have (names, phone numbers, etc.) String Generator makes random alphanumeric strings Password Generator makes secure passwords for your Wi-Fi or that extra Gmail account Clock Time Generator will pick random times of the day Calendar Date Generator will pick random days across nearly three and a half millennia

  17. Java generating non-repeating random numbers

    1 possible duplicate of Generate unique random numbers in Java - JB Nizet Apr 14, 2013 at 14:35 2 But if you remove repeated numbers, then they're not as random - 000

  18. How to make Math.random not repeat same numbers

    I assume you don't want to repeat until you've exhausted the array. There is also a secondary issue that you may/may not care about, that once the array is exhausted, the next value pulled out could repeat the latest value of the previous sequence.. So what you need is a random generator with state: it has to know which values are allowed from a pool of values, it needs to consume that ...

  19. c++

    If your random number generator can't repeat, it loses an important aspect of randomness. If someone knows the period, their accuracy of guesses increases as it reaches toward the end of the period, with 100% certainty on the last guess. - corsiKa Mar 21, 2011 at 18:44 7 srand () should be run ONCE and only once at program start-up. - Martin York

  20. Random Number generator that doesn't repeat itself

    1 I'm trying to create a random number generator between 1 and 500 that does not repeat itself. I made an array to keep track of if a generated number has been used but it doesn't seem to be working if (drawnTF[num] == false) { labels[labelNum].Visible = false;

  21. random number generator that doesn't repeat it self (cpp/c++)

    1 I want to make a function that generates numbers but doesn't repeat it self. If every number is generated the array can be emptied and it can start over again. This is the code I made but it doesn't work. The comments in the code explains the code a little. The largest number that is allowed is "howManyWords".