RU-ALLRUSSIAN 1985 Problem 19
A regular hexagon is divided into 24 equilateral triangles by lines parallel to its sides. 19 different numbers are assigned to the 19 vertices. Show that at least 7 of the 24 triangles have the property that the numbers assigned to its vertices increase counterclockwise.
Dataset text NuminaMath olympiads. Quoted with source.
Solutions
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