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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Using inclusion/exclusion .
Last edited by Plato; October 17th 2009 at 06:27 AM.
Originally Posted by Plato Using inclusion/exclusion . @ Plato - Hi Did you actually workout all the cases - "1,2,3,...,n couple together" and took a compliment or there was an easy way? Thanks
Originally Posted by aman_cc Did you actually workout all the cases - "1,2,3,...,n couple together" and took a compliment Exactly. I do not know another way.
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