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The maximum number of nodes in a tree for which post-order and pre-order traversals may be equal is ______

(a) 3

(b) 1

(c) 2

(d) any number

This key question is from Binary Trees topic in portion Binary Trees of Data Structures & Algorithms I

The question was asked in an online quiz.

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Best answer
Correct answer is (b) 1

For explanation: The tree with only one node has post-order and pre-order traversals equal.

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