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Problem #71

Random Selector

A random number selector can only select one of the nine integers 1, 2, ..., 9, and it makes these selections with equal probability. Let p be the probability that after n selections \left(n>1\right), the product of the n numbers selected will be divisible by 10. If n=5, find p\times59049.

Contributed by Sopan Khosla

Solved by 386 users

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