if total node is $N$

$n_l = \frac{2N+1}{3}$ ?

$n_l = \frac{2N+1}{3}$ ?

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In a 3-array tree if internal nodes have exactly 3 children,the number of leaf nodes will be __ ?

Does it vary for binary tree?

What do you mean by internal nodes? Non root node and leaf node?

Does it vary for binary tree?

What do you mean by internal nodes? Non root node and leaf node?

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