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sibling probab in a room

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sibling probab in a room

by ruplun » Sun Jul 31, 2011 6:32 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?

Ans: 16/21

CAN U EXPLAIN ME WITH DIAGRAM ....
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by GMATGuruNY » Sun Jul 31, 2011 6:54 am
I posted a solution here:

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