**Graph Theory Sheet C**

Prepared by:

Joseph Malkevitch

Department of Mathematics and Computer Studies

York College (CUNY)

Jamaica, New York 11451

1. For each of the graphs below, determine the minimum number of colors (labels) to color the vertices of the graph so that vertices which are joined by an edge get different colors.

a.

b.

c. (Note that in this diagram some of the edges meet a points which are not vertices of the graph:)

d.

e.

f.

g.