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In a room filled with 7 people, 4 people have exactly 1

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Senior Manager
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In a room filled with 7 people, 4 people have exactly 1 [#permalink] New post 13 Aug 2008, 15:24
In a room filled with 7 people, 4 people have exactly 1 friend in the room and 3 people have exactly 2 friends in the room (Assuming that friendship is a mutual relationship, i.e. if John is Peter's friend, Peter is John's friend). If two individuals are selected from the room at random, what is the probability that those two individuals are NOT friends?
a. 5/21
b. 3/7
c. 4/7
e. 5/7
f. 16/21
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Joined: 10 Aug 2008
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Schools: Emory Goizueta (Class of 2013)
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Re: probabilty-2 [#permalink] New post 13 Aug 2008, 17:54
7-t56826 - here's a post on this question
Re: probabilty-2   [#permalink] 13 Aug 2008, 17:54
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In a room filled with 7 people, 4 people have exactly 1

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