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Q3.a) Show that every planar graph has at least one vertex whose degree is s 5. Use a proof by contradiction b) Using the abo

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Q3) a) LEMMA Suppese G is a connected plane guaph Proof - Note that i Sords to o as 3 and G is Connected Bu Eulrs formula atlc) A tree is conckd graph that has ho cyoles S ConneC aus Wuse are no cycles -19-

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Q3.a) Show that every planar graph has at least one vertex whose degree is s 5. Use a proof by contradiction b) Using the above fact, give an induction proof that every planar graph can be colored...
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