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Q. a graph is called k-planar if every vertex has degree k. (a) Explain why any...

Q. a graph is called k-planar if every vertex has degree k.
(a) Explain why any k-regular graph with 11 vertices should contain an Euler’s circuit.

(what are the possible values of k).
(b) Suppose G is a 6-regular graph. Must the chromatic number of G be at leat 6? Explain.

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