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Probability:-)

by Shamhoon » Mon Apr 18, 2011 10:34 am
In a room filled with 7 people, 4 people have exactly 1 sibling in the room and 3 people have exactly 2 siblings in the room. If two individuals are selected from the room at random, what is the probability that those two individuals are NOT siblings?


5/21
3/7
4/7
5/7
16/21
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by Stuart@KaplanGMAT » Mon Apr 18, 2011 10:44 am
Hi!

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