Let G = (V,E) be a graph. Define ξ(G) = Σd id x d, where id is the number of vertices of degree d in G. If S and T are two different trees with ξ(S) = ξ(T),then

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51.	Let G = (V,E) be a graph. Define ξ(G) = Σd id x d, where id is the number of vertices of degree d in G. If S and T are two different trees with ξ(S) = ξ(T),then
A.	\|S\| = 2\|T\|
B.	\|S\| = \|T\|-1
C.	\|S\| = \|T\|
D.	\|S\| = \|T\|+1
Answer» D. \|S\| = \|T\|+1

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