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>=512 different isosceles triangles whose vertices have the same color

Source: Mathematics Regional Olympiad of Mexico West 2016 P6

September 7, 2022
Coloringcombinatoricscombinatorial geometry

Problem Statement

The vertices of a regular polygon with 20162016 sides are colored gold or silver. Prove that there are at least 512512 different isosceles triangles whose vertices have the same color.