anji28 Perfect
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Posted: Sun Apr 08, 2007 7:19 pm Post subject: marriage matchings |
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There are three families, each with two sons and two daughters. In how many ways can the sons all be monogamously matched with the daughters?
Generalize to M families, each with N sons and N daughters.
Note: Assume you can't marry within your own family, and all persons are heterosexual. Also, no one has a sex change.  |
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