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ISRO | ISRO CS 2018 | Question 65
  • Last Updated : 09 Jul, 2018

Determine the number of page faults when references to pages occur in 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 1 having brought earlier than page 2.(assume LRU algorithm is used)
(A) 3
(B) 4
(C) 5
(D) None of these


Answer: (B)

Explanation: The references to pages occur in order – 1, 2, 4, 5, 2, 1, 2, 4 can be seen in the figure:

So, option (B) is correct.

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