Question: Let G be a graph such that every vertex in G has degree at least 7, and G contains no cycles of length 3.

Let G be a graph such that every vertex in G has

Let G be a graph such that every vertex in G has degree at least 7, and G contains no cycles of length 3. Prove that G has at least 14 vertices. (Here, "graph" means a simple undirected graph with no loops.)

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