Explain LRU page replacement algorithm, Computer Engineering

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Explain LRU Page replacement algorithm.

LRU policy: It expands to least recently use. This policy proposes that we remove a page that last usage is farthest from present time. For reference string:  1, 2, 3, 4, 1, 2, 5, 1, 2, 3, 4, 5, we have the subsequent page faults:

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