MEMO 2007 ekipno problem 6


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28. travnja 2012.
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For a set P of five points in the plane, no three of them being collinear, let s(P) be the numbers of acute triangles formed by vertices in P.
Find the maximum value of s(P) over all such sets P.
Izvor: Srednjoeuropska matematička olimpijada 2007, ekipno natjecanje, problem 6