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Question of the Day - 25th August, 2009

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Senior | Next Rank: 100 Posts
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by quant-master » Mon Aug 24, 2009 3:28 pm
Question 1:

What is the probability for a family with three children to have a boy and two girls, assuming the probability of having a boy or a girl is equal?

a)1/8
b)¼
c)½
d)3/8
e)5/8

OAs will be posted in 24 hrs time

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https://gmat-quants.blocked - My Blog Updated almost daily with new quant fundas. Find collection of quants question in my blog
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by keough » Mon Aug 24, 2009 3:33 pm
Let P(B) = P(G) = 1/2

so, 1 Boy and 2 girls can be

1. B,G,G = 1/2*1/2*1/2 = 1/8
2. G,B,G = 1/8
3. G,G,B = 1/8

P(B and 2 Gs) = 1/8 + 1/8 + 1/8 = 3/8
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by quant-master » Tue Aug 25, 2009 3:48 pm
That's correct.

D is the right answer.

Let me know if anybody needs further explanation

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