Let G be a connected planar graph with 10 vertices. If the number of edges on each face is three, then the number of edges in G is _

Let G be a connected planar graph with 10 vertices. If the number of e

1.	Let G be a connected planar graph with 10 vertices. If the number of edges on each face is three, then the number of edges in G is _
A.	24
B.	20
C.	32
D.	64
Answer» B. 20

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Let G be a connected planar graph with 10 vertices. If the number of edges on each face is three, then the number of edges in G is _

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