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Question: 8 friends hold a party every two of them may...

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8 friends hold a party, every two of them may have a hug, but only once. It is not necessary that one guy give a hug to everyone else. For example, he may only have 4 or 6 hugs with other friends, etc. None pair of them hugs 2 times(Ex: A and B only hugs once). The question is if only 20 hugs happened, how many ways can this have occurred?

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