MathDB
3n points on a circuference, n arcs of lenght 1, no of length 2, n of lengths 3

Source: IMAC Arhimede 2012 p5

May 6, 2019
combinatoricscombinatorial geometryarccircle

Problem Statement

On the circumference of a circle, there are 3n3n colored points that divide the circle on 3n3n arches, nn of which have lenght 11, nn of which have length 22 and the rest of them have length 33 . Prove that there are two colored points on the same diameter of the circle.