Question: Suppose that G is a connected k-regular plane graph with n vertices and r regions (faces). Prove that n = 2 - r/1 - 1/2

Suppose that G is a connected k-regular plane graph with n

Suppose that G is a connected k-regular plane graph with n vertices and r regions (faces). Prove that n = 2 - r/1 - 1/2 k

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