OMM 1998 Problem 3
Cada uno de los lados y las diagonales de un octágono regular se pintan de rojo o de negro. Demuestre que hay al menos siete triángulos cuyos vértices son vértices del octágono y sus tres lados son del mismo color.
Official text Mexican Mathematical Olympiad 1998 official paper, page 1. Quoted with source.
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