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Random Numbers

Tools to select numbers randomly, make random draws of numbers according to several criteria and let randomness/chance decide.

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Random Numbers -

Tag(s) : Fun/Miscellaneous, Algorithm, Combinatorics

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# Random Numbers

## Random Numbers Selection

### How many numbers?

Tools to select numbers randomly, make random draws of numbers according to several criteria and let randomness/chance decide.

### How to make a random number selection?

Indicate the type of numbers to draw:

- choice according to an interval: select numbers between $a$ and $b$

Example: Draw $N$ digits between $1$ and $100$

- choice according to a size: select numbers with a certain number of digits

- choice according to a list: select numbers from a given list

Example: A phone number corresponds to N digits from 0 to 9

### What is a random number sample without replacement?

A draw without replacement specifies that a picked number can not be picked a second time.

Example: Draws of $3$ numbers between $1$ and $5$ could be $4,2,3$ or $1,5,2$ but never $1,2,2$ (the $2$ having been picked a first time, it is not put back into play)

During a draw without remplacement, it is not possible to pick more than $N$ numbers in a range of size $N$

Example: A selection of $100$ numbers between $1$ and $20$ is impossible without replacement

### What is a random number sample with replacement?

A draw with replacement specifies that a picked number may be picked one or more times.

Example: Draws of $3$ numbers between $1$ and $5$ could be $4,2,3$ or $1,5,2$ but also $1,2,2$ (the $2$ having been picked a first time, it is put back into play and can stand out)

During a draw with replacement, it is possible to pick more than $N$ numbers in a range of size $N$

Example: A selection of $100$ numbers between $1$ and $20$ is possible with replacement

## Source code

dCode retains ownership of the online 'Random Numbers' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (PHP, Java, C#, Python, Javascript, Matlab, etc.) no data, script or API access will be for free, same for Random Numbers download for offline use on PC, tablet, iPhone or Android !

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