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Out of a classroom of 6 boys and 4 girls the teacher picks a

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Joined: 26 Feb 2013
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Re: Comb - None [#permalink] New post 31 Aug 2013, 10:01
tejal777 wrote:
1.4C3/10C3
2. 6C3/10C3
3. 1-6C3/10C3



My head just can't how does it translate in English?
The only way I can translate it in order to understand it is (for No3 for example): "We choose all the boys and we divide by the selection of 3 people from a total of 10" :?
Why would divide by a bigger set? What are we trying to exclude here?
Re: Comb - None   [#permalink] 31 Aug 2013, 10:01
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Out of a classroom of 6 boys and 4 girls the teacher picks a

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