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9 points to convex pentagon (Posted on 2009-10-12) Difficulty: 4 of 5
Given a set of 9 points, no 3 collinear, prove there must be a subset of 5 that forms a convex pentagon.

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  Subject Author Date
re(3): Happy EndingJer2009-10-19 01:48:22
re(2): Happy EndingHarry2009-10-18 14:39:53
re: Happy EndingJer2009-10-18 01:22:37
Hints/TipsHappy EndingBrian Smith2009-10-18 00:54:51
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