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There's a basket containing 10 apples - 7 red and 3 green.

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There's a basket containing 10 apples - 7 red and 3 green. [#permalink] New post 02 Apr 2008, 09:28
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There's a basket containing 10 apples - 7 red and 3 green. What's the probability that upon drawing 3 apples, we get 2 red and 1 green?
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Re: PS probability--apples [#permalink] New post 02 Apr 2008, 09:34
There are three different ways that the apples can be picked (RRG, RGR, GRR)

Let's look at the first case (RRG)

P(RRG) = 7/10*6/9*3/8

Since we said the order of picking apples does not matter, we will have to similarly calculate probability for RGR and GRR cases which works out to the same.

So P(2Red,1Green) = 3*(7/10*6/9*3/8) = 21/40
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Re: PS probability--apples [#permalink] New post 02 Apr 2008, 10:51
\frac{C_7^2*C_3^1}{C_{10}^3} = \frac{21}{40}
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Re: PS probability--apples [#permalink] New post 02 Apr 2008, 11:32
neelesh wrote:
\frac{C_7^2*C_3^1}{C_{10}^3} = \frac{21}{40}


good, agreed...can you easily solve a related problem: 7-t62090
Re: PS probability--apples   [#permalink] 02 Apr 2008, 11:32
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There's a basket containing 10 apples - 7 red and 3 green.

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