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Operating System Virtual Memory Thrashing

Q Consider the following page reference string. 1 2 3 4 2 1 5 6 2 1 2 3 7 6 3 2 1 2 3 6 For FIFO page replacement algorithms with 3 frames, the number of page faults is?

A A. 16
B B. 15
C C. 14
D D. 11

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