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ISRO | ISRO CS 2008 | Question 67
Stack A has the entries a, b, c (with a on top). Stack B is empty. An entry popped out of stack A can be printed immediately or pushed to stack B. An entry popped out of the stack B can be only be printed. In this arrangement, which of the following permutations of a, b, c are not possible?
(A)
b a c
(B)
b c a
(C)
c a b
(D)
a b c
Answer
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