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# Making a unique random list of numbers

Posted on 1998-12-31

Task: I need an algorithm that would make a list of numbers that are unique, yet fall within a certain range of numbers. No number can be duplicated in this list.

Example: Given a range of numbers from 1 to 100, pick 20 numbers in this range at random, and store them in a list or array. None of the 20 numbers selected can occur more than once in this list/array.

Variables will be:

1) The quantity of unique numbers needed (e.g. 20 in the above example)

2) The range of numbers (e.g, 1-100)

If the algorithm is run twice, it should not produce the same results.

Can anyone provide such an algorithm?