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Choir of 5 boys and 6 Girls

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Re: Choir of 5 boys and 6 Girls [#permalink] New post 10 Aug 2013, 05:48
how to solve this question if the last condition is assumed as not caring the order of each 2 boys or 2 girls? it means that ie b1b2b3b4b5=b2b1b3b4b5 as same as that of girls.

anyone can help me?
Re: Choir of 5 boys and 6 Girls   [#permalink] 10 Aug 2013, 05:48

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Choir of 5 boys and 6 Girls

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