A complete n-node graph Kn is planar if and only if _____________(a) n ≥ 6(b) n^2 = n + 1(c) n ≤ 4(d) n + 3This question was posed to me in my homework.I would like to ask this question from Isomorphism in Graphs in section Graphs of Discrete Mathematics

A complete n-node graph Kn is planar if and only if _____________(a) n

1.	A complete n-node graph Kn is planar if and only if _____________(a) n ≥ 6(b) n^2 = n + 1(c) n ≤ 4(d) n + 3This question was posed to me in my homework.I would like to ask this question from Isomorphism in Graphs in section Graphs of Discrete Mathematics
Answer» The CORRECT choice is (c) n ≤ 4 Easy explanation: Any graph with 4 or LESS vertices is planar, any graph with 8 or less edges is planar and a complete n-node graph Kn is planar if and only if n ≤ 4.

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