Optimal Page Replacement policy - Example - Operating System

Q.  We have a process that has been allocated 3 page frames and initially none of the pages of the process are available in the memory. The following sequence of page references (reference string) is made by the process :
1, 2, 1, 3, 7, 4, 5, 6, 3, 1
If Optimal Page Replacement policy is used,  _______ page faults will occur for the above reference string.
- Published on 26 Aug 15

a. 7
b. 8
c. 9
d. 6

ANSWER: 7

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