Question

who calls the meeting of Gram Sabha and Gram Panchayat

Answer 1

Here is your answer mate..

The gram panchayat has a secretary who is responsible for the meeting of gram sabha and gram panchayat.

Hope it helps you..
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Answer 2

The binary nodes in a degree 2 which has n leaf nodes has n-1 nodes.

This can be proved by induction that a binary tree with n leaf nodes will have a total of 2n-1 nodes.

So the number of non leaf nodes is (2n-1)-n = n-1 .