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its simple 9*8=72
hi zaid ignore the previous post
you can take the analogy of function mapping
take 9 husbands as X and 9 wives as Y X TO Y
now total number of ways in which the game can be organised is total number of injections (P(9,9))
and there is only one way in which the husband and wives are pair together
so
the number of ways in which a mixed double game can be organized amongst 9 married couples if no husband or wife play in the same game is P(9,9) - 1
OR 9! - 1 for further explanation i am als giving the attachment
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