題組內容
二、 Only simple graphs are considered in this problem.
(c) Let G be a graph with 5 vertices. Prove that if every vertex of G has degree 2, then G must be a cycle.
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二、 Only simple graphs are considered in this problem.
(c) Let G be a graph with 5 vertices. Prove that if every vertex of G has degree 2, then G must be a cycle.