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MathNet 2018-part-03 — 181 problems (EN–VI) Question 58

Math Olympiad Vault · MathNet 2018-part-03 — 181 problems (EN–VI)

Question 58

100 points lie on the perimeter of a circle and they are arbitrary labeled by $1, 2, \ldots, 100$. We call a triangle **clockwise** if the increasing order of its vertices is in a clockwise fashion. Prove that it is not possible to have exactly $2017$ clockwise triangles.