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Siblings

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Siblings

by adam15 » Wed Nov 25, 2009 2:04 pm
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 capnx » Wed Nov 25, 2009 3:42 pm
great explanation here:
https://www.beatthegmat.com/probability-t48338.html
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