1.

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» D. 2k+1, k


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