Question: Prove that a planar graph on n vertices has at most 3n 6 edges. You don't have to use Euler's formula, but if you do

Prove that a planar graph on n vertices has at most 3n 6 edges. You don't have to use Euler's formula, but if you do use it can you provide the proof of that as well?

Please explain each part step-by-step.

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