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MathNet 2013 Question 72

Math Olympiad Vault · MathNet 2013

Question 72

The points of the plane have been colored by $2013$ different colors. We say that a triangle $\triangle ABC$ has the color $X$ if its three vertices $A$, $B$, $C$ have the color $X$. Prove that there are infinitely many triangles with the same color and the same area.