An interesting problem

Problem for Junior Group from Divisional Mathematical Olympiad will be solved here.
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Maryah_Dee
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Joined: Sat Mar 24, 2018 9:16 pm

An interesting problem

Unread post by Maryah_Dee » Sat Mar 24, 2018 9:25 pm

The base of a pyramid is a nine-sided convex polygon. Every diagonal of the polygon, and each pyramid's lateral edge is black or white. (The sides of the polygon at the base are not colored.) Demonstrate that there is three segments that have been colored with the same color and form a triangle.

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