【单选题】【消耗次数：1】
假设在一棵二叉树中，双分支结点数为15，单分支结点数为30个，则叶子结点数为（ ）个。
①
15
②
16
③
17
④
47
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设一棵m叉树中度数为0的结点数为N0，度数为1的结点数为Nl，……，度数为m的结点数为Nm，则N0=（）。
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