IMO Shortlist 1968 problem 24


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2. travnja 2012.
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Given k parallel lines l_1, \ldots, l_k and n_i points on the line l_i, i = 1, 2, \ldots, k, find the maximum possible number of triangles with vertices at these points.
Izvor: Međunarodna matematička olimpijada, shortlist 1968