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# A committee of three must be formed from 5 women and 5 men.

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A committee of three must be formed from 5 women and 5 men. [#permalink]  09 Oct 2017, 23:07
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50% (00:54) correct 50% (00:02) wrong based on 2 sessions
A committee of three must be formed from 5 women and 5 men. What is the probability that the committee will be exclusive to one gender?

(A) 1/60

(B) 1/120

(C) 1/8

(D) 1/6

(E) 1/3

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[Reveal] Spoiler: OA
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Joined: 20 Apr 2016
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Re: A committee of three must be formed from 5 women and 5 men. [#permalink]  10 Oct 2017, 03:55
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Bunuel wrote:
A committee of three must be formed from 5 women and 5 men. What is the probability that the committee will be exclusive to one gender?

(A) 1/60

(B) 1/120

(C) 1/8

(D) 1/6

(E) 1/3

Kudos for correct solution.

Here total number of members (men and women) = 10

NOw we need to choose 3 out of these. Again favourable events to one gender will be 5C3 (since both men and women are 5 in numbers)

Since $$probability = \frac{No. of favourable events}{Total possible outcomes}$$

i.e $$probability = \frac{5C3}{10C3} + \frac{5C3}{10C3}$$ (we have taken two times 5C3 because we need to have exclusive to one gender i.e either men or women, so combining them will give us total number of favorable events)

$$= \frac{1}{12} +\frac{1}{12} =\frac{1}{6}$$
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Re: A committee of three must be formed from 5 women and 5 men.   [#permalink] 10 Oct 2017, 03:55
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