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1. |
An ordered n-tuple (d1, d2, … , dn) with d1 >= d2 >= ⋯ >= dn is called graphic if there exists a simple undirected graph with n vertices having degrees d1, d2, … , dn respectively. Which of the following 6-tuples is NOT graphic |
A. | (1, 1, 1, 1, 1, 1) |
B. | (2, 2, 2, 2, 2, 2) |
C. | (3, 3, 3, 1, 0, 0) |
D. | (3, 2, 1, 1, 1, 0) |
Answer» D. (3, 2, 1, 1, 1, 0) | |