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Can any one help me out with this question :

This was asked in MadeEasy CBT held on 23rd jan 

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$=0.6*40 + 0.4*0.5(40+50*2) +0.4*0.5(40+ 50*2 + 150*4)$
$=24 + 0.2(140) + .2(740)$
$=24 + 28 + 148$
$= 200$ ns

Note that, on a miss in L1 and L2, blocks will be transferred from one level to next level.

PS: As pic quality is low so i assumed that respective hit ratios are 0.6, 0.5 and 1.
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