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Using the evaluation of prefix algorithm, evaluate +-9 2 7.

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Using the evaluation of prefix algorithm, evaluate +-9 2 7.

(a) 10

(b) 4

(c) 17

(d) 14

The question is from Application of Stacks in section Application of Stacks of Data Structures & Algorithms I

This question was addressed to me in an interview for job.

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Right choice is (d) 14

Easiest explanation - Using the evaluation of prefix algorithm, +-9 2 7 is evaluated as 9-2+7=14.

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