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Which one of the following permutations can be obtained the output using stack assuming that the input is the sequence 1,2,3,4,5 in that order ?

A. 3,4,5,2,1

B. 3,4,5,1,2

C. 5,4,3,1,2

D. 1,5,2,3,4

Correct Answer : A.


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