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min no of colors for n points and their segments, under 2 conditions

Source: Mathematics Regional Olympiad of Mexico Center Zone 2008 P4

November 9, 2021
Coloringcombinatorics

Problem Statement

Let nn points, where there are not 33 of them on a line, and consider the segments that are formed by connecting any 22 of the points. There are enough colors available to paint the points and the segments, coloring them with the following two rules: a) All the segments that reach the same point are painted of different colors. b) Each point is painted a different color to all the segments that reach it. Find the minimum number of colors needed to make such a coloring.