ITPEC IP April 2018 Question 5
ITPEC IP April 2018 — Question 5 of 100
After all four stack operations, the boxes are 2 on top of 1. Starting top-first with 4, 3, 2, 2, 1: operation 1 replaces 4 and 3 with 7; operation 2 pushes 3; operation 3 replaces 3, 7, 2 with their average 4; operation 4 replaces 4 and 2 with |4 - 2| = 2.
Answer (b)
Why not others:
- (a) incorrectly removes the remaining bottom box
- (c) shows the state before the final difference operation
- (d) does not reflect the boxes removed during the averaging and difference operations
Key rule: A stack is last-in, first-out: every take removes items from the top, and every new result is pushed back onto the top.
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