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19 Jul 2006, 14:14
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Hi,
Can someone help with this question ?
Thanks in advance.
Can someone help with this question ?
Thanks in advance.
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THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.
If you would like to discuss this question please re-post it in the respective forum. Thank you!
To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
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19 Jul 2006, 19:08
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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
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
