Question: In a complete binary tree or perfect binary tree, every inner node has exactly two children. If there are 21 leaf nodes or exterior nodes

In a complete binary tree or perfect binary tree, every inner node has exactly two children. If there are 21 leaf nodes or exterior nodes in the tree, how many internal nodes are there in the perfect binary tree?

A. 19

B. 20

C. 22

D. 18

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