# Chromatic numbers

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2. Let G = (V,E) be a graph where V {1,2,3,4,5,6,7,8,9,10,11,12} and E contains all edges connecting to vertices a and b such that ab=0 (mod 3). What is the chromatic number of G? Is G planar?

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#### Solution Summary

This solution shows how to find the chromatic number.

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