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Consider a machine with byte addressable main memory of 30 bits, block size of 16 bytes and 4-way set
associative cache of size 256 byte. For choosing the block to be replaced, use last recently used scheme.
The number of cache misses for the following sequence of block addresses is 12, 28, 18, 15, 19, 31, 39, 15,
7, 15 is ________.

 

what is last recently used?

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HOW TO SOLVE ?PLEASE PROVIDE THE COMPLETE SOLUTION.