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Suppose that a program performs an intermixed sequence of (stack) push and pop operations. The push operations put the integers 0 through 9 in order onto the stack; the pop operations print out the return values. Which of the following sequence (s) could not occur?

a. 4321098765

b. 2143658790

c. 0465381729

d. 4687532901

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Answers (1)
  1. 22 December, 13:57
    0
    c and d.

    c. 0465381729

    d. 4687532901

    Explanation:

    Once an item has been stacked on top of another item, there

    is no way to pop them in a different order.
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