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in cache performace i have confusion about where to use which formula like

for write through whether use H (tc) + (1-H) (tc+m) or  H (tc) + (1-H) (m)

and how to identify whether cache memory is hierarchical or not from question

can anyone give me all formula related to cache performance with explanation

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and what is the formula for write back cache?
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Use the hierarchical one..
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ok thanks