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no of diagonals inside a 2009-gon, every diagonals cuts at most another

Source: Germany Federal - Bundeswettbewerb Mathematik 2009, round 2, p4

April 9, 2020
combinatorial geometrycombinatoricsdiagonals

Problem Statement

How many diagonals can you draw in a convex 20092009-gon if in the finished drawing, every drawn diagonal inside the 20092009-gon may cut at most another drawn diagonal?