Question: Given a planar graph G such that all the vertices have even degrees: Prove that all the regions separated out by this graph (all

Given a planar graph G such that all the vertices have even

Given a planar graph G such that all the vertices have even degrees: Prove that all the regions separated out by this graph (all the faces) can be 2-colored. That is, the faces can be colored such that no two faces which share an edge can have same color. (Hint: Use induction. Look at outer rim of the graph and think about removing all the edges of the outer rim.)

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