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What is the postfix expression for the following expression tree?

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What is the postfix expression for the following expression tree?

(a) abcde++**

(b) ab+cde+**

(c) abc+de+**

(d) abcd+*e+*

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

This question was posed to me in an international level competition.

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Right answer is (b) ab+cde+**

Easy explanation - If the given expression tree is evaluated, the postfix expression ab+cde+** is obtained.

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