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Suppose it takes $100$ ns to access a page table and $20$ ns to access associative memory with a $90$% hit rate, the average access time equals :

  1. $28$       
  2. $20$       
  3. $90$      
  4. $100$
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access time = time for associative memory * hit ratio + time for main memory 
= 20*0.9 + 100(1-0.9)
=28ns
 

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