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In a room filled with 7 people, 4 people have exactly 1 [#permalink]
17 Jul 2006, 16:47
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. If two individuals are selected from the room at random, what is the probability that those two individuals are NOT friends?
Can someone please show me a quick way to approach this question. I figured it out but it's taken me way too long..