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Give an equation to calculate the minimum number of nodes in a complete binary tree of...

Give an equation to calculate the minimum number of nodes in a complete binary tree of height h. This means that every height 1,..,h-1 is completely full.

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Answer #1 
the minimum number of nodes in a complete binary tree of height h means All h-1 levels are completely full and last level have one node

minimum number of nodes in a complete binary tree of height h
= 2^0 + 2^1 + …. 2^(h-1) - 1
= 2^h - 1

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