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Mutually friendly 3 (Posted on 2012-08-05) Difficulty: 4 of 5
Prove that if any two people are either friends or strangers, then any group of 18 people contains either 4 mutual friends or 4 mutual strangers.

See The Solution Submitted by Math Man    
Rating: 5.0000 (1 votes)

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re(3): No Subject | Comment 7 of 11 |
Yes I see your points.  Thanks guys.  Guess I'm going back to the drawing board.
  Posted by Chris, PhD on 2012-08-07 11:36:30
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