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

Random Numbers - dCode

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

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A random number is a number selected at random from an interval. The randomly selected number is usually either an integer or a decimal number.

Most often the number is calculated by computer using pseudo-randomness functions like rand() or random().

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`

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 replacement, 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

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

Option 1: list the even numbers (if there are not too many) and draw from this list.

Option 2: Multiply the numbers obtained by 2, they will all be even.

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Source : https://www.dcode.fr/random-number

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