how to create an array of non-repeated rand numbers

Question

I would like to create a array having 21 values between 0 to 20.I would like them to be in random and at the same time non-repeated.

I know how to create a random number

Answer 1

It sounds like you're making it harder than necessary. Why don't you create an array of the numbers 1-20, and then randomize it through a shuffle.