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GMAT prep Q5

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GMAT prep Q5 [#permalink] New post 19 Jul 2006, 13:14
Hi,

Can someone help with this question ?

Thanks in advance.
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Re: GMAT prep Q5 [#permalink] New post 19 Jul 2006, 15:13
= (60/1000)(1/800) = 3/40,000
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Re: GMAT prep Q5 [#permalink] New post 19 Jul 2006, 18:08
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This can be explained as :

There are 60 sibling pairs, probability of picking a senior sibling is 60/1000. Only one out of the junior will make this a sibling pair, the probability of which is 1/800. So the combined probabilty is 60/1000 * 1/800 = 3/40000
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 [#permalink] New post 20 Jul 2006, 01:01
There are 60 people among 1000 who has a sibling among the 800.

Probability of choosing from group 1 = 60/1000
Now that we have selected one person from group one, that person has only 1 sibling in the second group.
Probability of choosing from group 2 = 1/800

Total = 60/1000 *1/800 = 3/40000
  [#permalink] 20 Jul 2006, 01:01
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