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2003 AMC 8 Problems/Problem 18

Revision as of 13:29, 10 July 2012 by Yunyun333 (talk | contribs)

There are 3 people who are friends with only each other who won't be invited, plus 1 person who has no friends, and 2 people who are friends of friends of friends who won't be invited. So the answer is D (6).

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