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18. (5pts) Why do we need page replacement algorithms? Describe how FIFO, LRU (by maintaining a linked list of pages), and WSClock Page replacement algorithms

18. (5pts) Why do we need page replacement algorithms? Describe how FIFO, LRU (by maintaining a linked list of pages), and WSClock Page replacement algorithms work. Also comment on their advantages, disadvantages, and their feasibility

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