Question: Let G = (V, E) be a loop-free undirected graph with |V| = n. Prove that G is a tree if and only if P(G,

Let G = (V, E) be a loop-free undirected graph with |V| = n. Prove that G is a tree if and only if P(G, λ) = λ(λ - 1)n-1.

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