If G is a graph with e edges and n vertices, the sum of the degrees of all vertices in G is
(A) e
(B) e/2
(C) e2
(D) 2 e
Answer: (D)
Explanation: Since the given graph is undirected, every edge contributes as twice in sum of degrees. So the sum of degrees is 2e.
Option (D) is correct.
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