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https://gateoverflow.in/872/gate2002-19

IN THE SOLUTION GIVEN BY Akash Kanase  I am not getting the reason behind  using  this formula

No. of bits in first level page table to address a second level page table is log2 of

Physical memory size /(#Entries in a Second level page table × PTE size) ...why we are using PA

AND HOW THE MAXIMUM NUMBER OF PAGETABLES IN 2ND LEVEL CAN BE 220 ....??

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