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There are 5 married couples and a group of three is to be

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There are 5 married couples and a group of three is to be [#permalink] New post 09 Oct 2006, 11:21
There are 5 married couples and a group of three is to be formed out of them; how many arrangements are there if a husband and wife may not be in the same group?
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Re: PnC [#permalink] New post 09 Oct 2006, 19:39
This is the third time I am seeing this question :)
10C3 - 40 is the answer

3 people can be chosen in 10C3 ways.

number of ways in which a couple is always there in the group of 3 = 8+8+8+8+8 = 40
Re: PnC   [#permalink] 09 Oct 2006, 19:39
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