Q.

A graph has 20 vertices. The maximum number of edges it can have is? (Given it is bipartite)

A. 100
B. 140
C. 80
D. 20
Answer» A. 100
Explanation: let the given bipartition x have x vertices, then y will have 20-x vertices. we need to maximize x*(20-x). this will be maxed when x=10.
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