1.

Let δ denote the minimum degree of a vertex in a graph. For all planar graphs on n vertices with δ ≥ 3, which one of the following is TRUE?

A. In any planar embedding, the number of faces is at least \(\frac{n}{2} + 2\)
B. In any planar embedding, the number of faces is less than \(\frac{n}{2} + 2\)
C. There is a planar embedding in which the number of faces is less than \(\frac{n}{2} + 2\)
D. There is a planar embedding in which the number of faces is at most \(\frac{n}{{\delta + 1}}\)
Answer» B. In any planar embedding, the number of faces is less than \(\frac{n}{2} + 2\)


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