Question: Prove that a complete graph with n vertices has [n*(n-1)] / 2 edges Please explain me how does proving that works. Thank you! A complete

Prove that a complete graph with n vertices has [n*(n-1)] / 2 edges

Please explain me how does proving that works. Thank you!

A complete bipartite graph is a bipartite graph in which each vertex in the first set is connected to each vertex in the second set by exactly one edge. If the first set has m elements and the second set has n elements, then the complete bipartite graph is denoted Km,n.

I get that but how can I apply it?

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