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For anyone visiting this thread in the future, FIFO can have less page faults in some scenarios. In this one ( <2, 6, 5, 7, ..., ..., ...> ), it can be completed with 2, 8, 6. The access of 2 means that the least recently used page is 6, but the first page in is still 2. The access of 8 replaces 2 in FIFO, but 6 in LRU. The access of 6, therefore, is ...


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