How many ways are there to seat n married couples in a row of 2n chairs such that the couples never sit next to each other?

Shouldnt it be as as simple as n.C.2n divided by 2!

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- Oct 17th 2009, 01:52 AMDeRSeDArrangement of couples
How many ways are there to seat n married couples in a row of 2n chairs such that the couples never sit next to each other?

Shouldnt it be as as simple as n.C.2n divided by 2! - Oct 17th 2009, 05:17 AMPlato
Using inclusion/exclusion .

- Oct 17th 2009, 06:42 AMaman_cc
- Oct 17th 2009, 06:58 AMPlato