Question: Given a planar graph P = (V, E), we have Euler's formula: V+ |F| - E| = 2, where F is the set of faces

Given a planar graph P = (V, E), we have Euler's

Given a planar graph P = (V, E), we have Euler's formula: V+ |F| - E| = 2, where F is the set of faces of P and E is the set of edges of P. Let |V] = n, where V is the set of vertices of P. Prove that F is at most 2n

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