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Question

A graph which has the same number of edges as its complement must have number of vertices congruent to ______ or _______ modulo 4(for integral values of number of edges).

a.

6k, 6k-1

b.

4k, 4k+1

c.

k, k+2

d.

2k+1, k

Answer: (c).k, k+2

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Q. A graph which has the same number of edges as its complement must have number of vertices congruent to ______ or _______ modulo 4(for integral values of number of edges).

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