Please use words to describe the solution process:
Let G be a graph with n vertices that is not a complete graph. Prove that x (G) < n
HINT: If G does not contain k3 as a subgraph, then every face must have degree at least 4.
*(Please see attachment for proper symbols)
A Graph Colouring Problem is solved. The solution is well presented. The solution was given a rating of "5" by the student who originally posted the question.