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

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Intern
Joined: 01 Dec 2007
Posts: 32
Followers: 1

Kudos [?]: 10 [0], given: 0

In a room filled with 7 people, 4 people have exactly 1 [#permalink]  09 Dec 2007, 14:09
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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?

5/21
3/7
4/7
5/7
16/21
CEO
Joined: 17 Nov 2007
Posts: 3574
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 414

Kudos [?]: 2243 [0], given: 359

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