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I don't really know if this is considered a challenging problem but this is not for homework:

You're given a set of numbers S of size n. From S, you draw a random sample A, |A| < n. From S, you draw a random sample B, |B| < n. Sampling doesn't remove items from S. What is the probability that intersection of A and B has size 1?

Monte

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# Random Sampling: Set Inclusion

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