Determine the number of page faults when references to pages occur in the following order:
1, 2, 4, 5, 2, 1, 2, 4
Assume that the main memory can accommodate 3 pages and the main memory already has the pages 1 and 2, with page one having brought earlier than page 2. (LRU page replacement algorithm is used)
(A) 3
(B) 5
(C) 4
(D) None of these


Answer: (C)

Explanation:

So, option (C) is correct.

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