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In which one of the following page replacement algorithms it is possible for the page fault rate to increase even when the number of allocated frames increases?

1. LRU (Least Recently Used)
2. OPT (Optimal Page Replacement)
3. MRU (Most Recently Used)
4. FIFO (First In First Out)

Correct answer: FIFO (First In First Out)

Solution

FIFO can lead to an increase in page fault rates when more frames are allocated because it may evict pages that are still needed, unlike other algorithms that consider usage patterns.

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