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++a*bc*+defg is an?

(a) postfix expression

(b) infix expression

(c) prefix expression

(d) invalid expression

The origin of the question is Trees in division Trees of Data Structures & Algorithms I

This question was addressed to me in homework.

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Best answer
Right choice is (c) prefix expression

The best I can explain: It is a prefix expression obtained from a preorder traversal since it is of the form operator-operand-operand.

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