Consider the list of page references in the time line as below:
9 6 2 3 4 4 4 4 3 4 4 2 5 8 6 8 5 5 3 2 3 3 9 6 2 7
What is the working set at the penultimate page reference if ∆ is 5?
working set at the penultimate(second from the last) page reference if ∆ is 5.
hence the answer is d. (3,9,6,2)
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