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

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Re: Comb - None [#permalink]

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New post 31 Aug 2013, 11:01
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?
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Re: Out of a classroom of 6 boys and 4 girls the teacher picks a [#permalink]

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Re: Out of a classroom of 6 boys and 4 girls the teacher picks a [#permalink]

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New post 11 Jun 2015, 00:23
for only girls--> 4c3/10c3
ony boys--> 6c3/10c3
atlest one girl--.1-(6c3/10c3)
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Re: Out of a classroom of 6 boys and 4 girls the teacher picks a [#permalink]

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New post 30 Jul 2016, 08:22
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Re: Out of a classroom of 6 boys and 4 girls the teacher picks a   [#permalink] 30 Jul 2016, 08:22
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