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The sum of an n-node graph and its complement graph produces a graph called _______

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The sum of an n-node graph and its complement graph produces a graph called _______

(a) complete graph

(b) bipartite graph

(c) star graph

(d) path-complement graph

The question was posed to me at a job interview.

The doubt is from Different Path in a Graph in section Graphs of Discrete Mathematics

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Right answer is (a) complete graph

The best I can explain: Suppose, the complement G’ of a graph G is known as edge-complement graph which consists of with the same vertex set but whose edge set contains the edges not present in G. The graph sum G+G’ on an n-node graph G is called the complete graph say, Kn.

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