Four married couples attend a party. Each person shakes hands with every other person, except their own spouse, exactly once. How many handshakes?counting hands shakePuzzle - In how many pairings can 25 married couples dance when exactly 7 men dance with their own wives?Graph Theory number of handshakes of couplesHandshakes in a partyHow many mixed double pairs can be made from 7 married couples provided that no husband and wife plays in a same set?In how many ways can 10 married couples line up for a photograph if every wife stands next to her husband?How many ways are there to order $n$ women and $n$ men in circleFinding the number of combinations.Round table combinatoricsNumber of handshakes - exclusion apporach
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