You have a function which gets k as input and in o(1) time returns a random number between 1 to k. Create a function that returns a random permutation (a list of the numbers 1 to n in a random order), optimize for speed (I think O(n) is best).
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Pseudo-code verbal: print 1 through 100, and for every number that's divisible by 2 print A, for every number that's divisible by 5 print B, and for every number that's divisible by 2 and 5 print AB
find the avg of a list. data mining
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