For a binary tree with n nodes, How many nodes are there
which has got both a parent and a child?
Answer / Preeti Rani
In a binary tree, every node except for the root node (if present) and leaf nodes (nodes without any children) have both a parent and a child. Therefore, in a binary tree with n nodes, the number of nodes that have both a parent and a child is n - number of leaves - 1.
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