Proof: inequality involving vertices and edges of a graph

restin84

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Joined
Oct 24, 2011
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7
I have a proof to do for school.

Prove that in any simple graph G with n vertices and m edges, 2m <= n^2 - n

I just need a little push in the right direction. I'm having trouble even coming up with a starting point. I also cannot find many problems similar to this one so that I may practice.
 
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