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Source: May Olympiad(Olimpiada de Mayo) 2010

May 10, 2018
combinatorics

Problem Statement

Let nn be a integer 1<n<20101<n<2010, where we have a polygon with 20102010 sides and nn coins, we have to paint the vertices of this polygon with nn colors and we've to put the nn coins in nn vertices of the polygon. In each second the coins will go to the neighbour vertex, going in the clockwise. Determine the values of nn such that is possible paint and choose the initial position of the coins where in each second the nn coins are in vertices of distinct colors