Question: A job has four pages A , B , C , D and the main memory has two page frames only. The job needs to

A job has four pages A

,

,

,

D and the main memory has two page frames only. The job needs to process its pages in following order: ABACABDBACD Assuming that the page interrupt occurs when a new page is brought in the main memory, irrespective of whether the page is swapped out or not. The number of page interrupts optimal page replacement algorithms are

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