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K complete graph

  1. Apr 29, 2008 #1
    I'm having problems taking a stab at this question:

    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.
  2. jcsd
  3. Apr 29, 2008 #2
    Doesn't the ratio of [itex]x[/itex] to [itex]y[/itex] mean [itex]\frac{x}{y}[/itex]?
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