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Belady's anomaly is a situation when (for a particular page replacement algorithm) on increasing the available no. of physical frames the PAGE FAULT also INCREASES.

>>Generally the page fault should decline on increasing the number of frames.

Belady even proved it with FIFO.

So, optimal page replacement algo was developed =>it seeks into the future and replace those pages which won't be used for along time.

As it is practically difficult to implement so the reverse is done ==>LRU(Look into the past for pages that are least recently used assuming that they will not be used in the future too.)

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