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Questions about algorithms that deterministically generate sequences of numbers that have stochastic properties of random sequences.

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Given a random number generator rand5() generate gen7()

(For some reason, this old question came up first) rand5()+rand5()*5 would give numbers 0-24, each with a probability of 1/25. You could use the first 21 of these to return 0-6 with equal probabililt …
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