Probability:-)

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Shamhoon: Junior | Next Rank: 30 Posts; Posts: 17; Joined: Sun Aug 22, 2010 5:39 am; Location: Kingdom of Saudi Arabia; GMAT Score:320

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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Source: Beat The GMAT — Problem Solving | Mon Apr 18, 2011 10:34 am

Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Mon Apr 18, 2011 10:44 am

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