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

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In a room filled with 7 people, 4 people have exactly 1 [#permalink] New post 17 Feb 2008, 14:23
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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
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Re: PS: Friends ? [#permalink] New post 17 Feb 2008, 14:36
Great explanation from walker...

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Re: PS: Friends ?   [#permalink] 17 Feb 2008, 14:36
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