Show that the edge chromatic number of a graph must be at least as large as the maximum degree of a vertex of the graph. (a) Can a simple graph exist with 10 vertices each of degree four?, Give a diagram of this graph and the number of edges produced.

Q: А. B. 2 2 1 -2 10 -2-1 2 3. -6 -8 -10 -12 -14 С. D. 3 -5-43 -2 -1. 2x 1 2 45 2x -2 -2

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