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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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Hints/Tips Happy Ending | Comment 1 of 4

This problem, along with 8 points no convex pentagon and 5 points to convex quad are parts of the Happy Ending problem and its generalization, see

(I think this particular problem is a little too ambitious for Perplexus members)

  Posted by Brian Smith on 2009-10-18 00:54:51
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