A simple graph G with n-vertices is connected if the graph has

1
(n - 1) (n - 2)/2 edges
2
more than (n - 1) (n - 2)/2 edges
3
less than (n - 1) (n - 2)/2 edges
4
\(\Sigma^k_{i=1}C(n_i, 2)\) edges

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