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Say i have a Cache with hit ratio 96% and access time 1ns and a memory with access time 10 ns 

Now by default we go for Sequential access instead of Parallel

Now...  Tavg = 0.96*(1) + 0.4*(1+10)   this will be the answer rt?

My doubt is For sequential access of memory units we do  Tavg = t1 + (1-h)*(t1 + t2) then why we havent applied this concept in above question. i.e. How to know which one to apply??

Like used in Question:- https://gateoverflow.in/788/gate2003-78    they have used First one instead of Second.Please help me out??

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