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

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Senior Manager
Joined: 19 Nov 2007
Posts: 475
Followers: 3

Kudos [?]: 78 [0], given: 4

In a room filled with 7 people, 4 people have exactly 1 [#permalink]  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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Intern
Joined: 10 Aug 2008
Posts: 22
Schools: Emory Goizueta (Class of 2013)
WE 1: Management consultant
WE 2: Marketing consultant
Followers: 0

Kudos [?]: 0 [0], given: 1

Re: probabilty-2 [#permalink]  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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