Question 531828: no. of ways a lawn tennis mixed doubles can be made up from 7 married couples if no husband and wife play in same set
Answer by josmiceli(19441)   (Show Source):
You can put this solution on YOUR website! Here's my try.
You should get another opinion, too
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One of the male players has 7 women he can choose
as a partner, minus his wife = 6
The number of possible pairs is 7*6
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The other male player is one of the 6 remaining, and
he can choose one of 6 remaining women, minus his wife = 5
The number of possible pairs is 6*5.
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The number of possible matches is 7*6*6*5 = 1260
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