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One hexagon and 18 segments.

Source: Tuymaada 2002, day 1, problem 1. - Author : A. Golovanov.

May 3, 2007
modular arithmeticcombinatorics proposedcombinatorics

Problem Statement

Each of the points GG and HH lying from different sides of the plane of hexagon ABCDEFABCDEF is connected with all vertices of the hexagon. Is it possible to mark 18 segments thus formed by the numbers 1,2,3,,181, 2, 3, \ldots, 18 and arrange some real numbers at points A,B,C,D,E,F,G,HA, B, C, D, E, F, G, H so that each segment is marked with the difference of the numbers at its ends?
Proposed by A. Golovanov