KöMaL 2025 B5499
Each of the vertices of a regular 45-gon are colored red, yellow or green, and each color is used exactly 15 times. A triangle is red (yellow, green), if all three of its vertices is red (yellow, green). Prove that there exists a red, a yellow and a green triangle, all three of which are congruent to each other.
Official text KöMaL. Quoted with source.
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