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GATE | Gate IT 2008 | Question 73

Difficulty Level : Medium
Last Updated : 28 Jun, 2021

A binary tree with n > 1 nodes has n₁, n₂ and n₃ nodes of degree one, two and three respectively. The degree of a node is defined as the number of its neighbors.

n₃ can be expressed as
(A) n₁ + n₂ – 1
(B) n₁ – 2
(C) [((n₁ + n₂)/2)]
(D) n₂ – 1

Answer: (B)

Explanation:

Quiz of this Question