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From a group of 3 boys and 3 girls, 4 children are to be

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Intern
Joined: 08 Nov 2008
Posts: 29

Kudos [?]: 48 [0], given: 0

From a group of 3 boys and 3 girls, 4 children are to be [#permalink]

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11 Nov 2008, 13:36
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

From a group of 3 boys and 3 girls, 4 children are to be randomly selected. What is the probability that equal numbers of boys and girls will be selected?

A.1/10

B. 4/9

C.1/2

D.3/5

E.2/3

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Manager
Joined: 16 Oct 2008
Posts: 54

Kudos [?]: 2 [0], given: 0

Re: boys and girls---27 [#permalink]

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12 Nov 2008, 00:45
IMO : D

Case : Equal boy & girl 3C2 * 3C2 = 9
Event : 6C4 = 15
Prop = 9/15 = 3/5

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CEO
Joined: 17 Nov 2007
Posts: 3584

Kudos [?]: 4587 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Re: boys and girls---27 [#permalink]

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12 Nov 2008, 00:52
This is a nice example of symmetry. If you exchange girls and boys, the problem remains the same. So, the answer is 1/2.

Edit: this reasoning is incorrect. 3C2*3C2/6C4 is correct
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Kudos [?]: 4587 [0], given: 360

Re: boys and girls---27   [#permalink] 12 Nov 2008, 00:52
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From a group of 3 boys and 3 girls, 4 children are to be

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