【单选题】【消耗次数：1】
假定一棵三叉树的结点数为50，则它的最小高度为（ ）。
①
3
②
4
③
5
④
6
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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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