(a) If a tree has four vertices of degree 2, one vertex of degree 3, two of...

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(a) If a tree has four vertices of degree 2, one vertex of degree 3, two of degree 4, and one of degree 5, how many pendant vertices does it have?
(b) If a tree T = (V, E) has v2 vertices of degree 2, v3 vertices of degree 3,..., and vm vertices of degree m, what are |V| and |E|?
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