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Which of the following statement is invalid with respect to balancing symbols?

(a) [(A+B) + (C-D)]

(b) [{A+B}-{C-[D+E]}]

(c) ((A+B) + (C+D)

(d) {(A+B) + [C+D]}

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

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

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Best answer
Right answer is (c) ((A+B) + (C+D)

The best explanation: ((A+B) + (C+D) is invalid because the last close brace is not found in the statement.

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