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Find a formula for the number of edges in Kn. What happens to the ratio of edges to verticies as n increases?

Formula: n/2 * (n-1)

Ratio: this is the part I can't figure out. I assumed the ration is n/(n/2*(n-1))

Give a brief verbal argument that employs this rule of inference?

Find a necessary relationship between the number of edges and number of vertices's of a graph G if it can be represented on a Torus?

The last two parts have completely stumped me.