Answer / vivek sharma

Ans-21
Let us take a tree with 5 nodes (n=5)

It will have only 6 (ie,5+1) null branches. In general,
A binary tree with n nodes has exactly n+1 null nodes.


hence n = 20
s0.. n+1= 21

Answer / vishal kumar

21

Answer / phool chand

21

Let us take a tree with 5 nodes (n=5)

It will have only 6 (ie,5+1) null branches. In general, A binary tree with n nodes has exactly n+1 null nodes.

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