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Computer Org- write through and write back

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In case of Look-through:

Tavg = 0.95*30 +0.05*(30+300) = 28.5 + 16.5 = 45

In case of Look-aside:

Tavg = 0.95*30 + 0.05*300 = 43.5

difference= 45 -43.5

              =1.5
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