20 married couples are to be seated around a circular table.In how many ways can they be made to sit if men and women sit alternately and that no women sits adjacent to her husband.

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- Jan 13th 2010, 05:20 PMpankajArrangement around a circle
20 married couples are to be seated around a circular table.In how many ways can they be made to sit if men and women sit alternately and that no women sits adjacent to her husband.

- Jan 13th 2010, 05:28 PMawkward
Hi pankaj,

This is a famous problem called the menage problem. You can find a discussion here:

Ménage problem - Wikipedia, the free encyclopedia