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1. |
Suppose G be a connected planar graph of order n≥5 and size m. If the length of the smallest cycle in G is 5, then which of the following is true? |
A. | (m+n)4>=mn |
B. | m≤5/3(n−2) |
C. | (m2+n)/3 |
D. | n>=(6/5)(n+1) |
Answer» C. (m2+n)/3 | |