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Consider a system implementing a 2 level page table. Memory access time = 10ns. Hit ratio of page table = 0.3.  Page fault access time = 50ns.

What is average access time ?

Here my doubt is when considering page hit, do we write it as 0.3(10) or 0.3(10+10+10) as we need to access 2 page tables first and then access main memory for hit ?
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