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Possible Duplicate:
What's the General Expression For Probability of a Failed Gift Exchange Draw

4 couples are doing a gift exchange. Names are drawn randomly. Everyone gets a gift, but no one is allowed to pick either themself or their spouse. How many successful arrangements are there?

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    @joriki, speaking only for myself, I was too rushed to read the other questions closely enough to be certain there is a duplication. But if you are convinced, pick one, vote to close, and I'll go along with you.2011-12-12

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