Question: why is the answer 4 levels not 3 ? Assume a 1 2 x 1 2 parallel multiplier with an accumulator ( MAC ) is

why is the answer 4 levels not 3?Assume a 12x12 parallel multiplier with an accumulator (MAC) is to be designed by the
above-mentioned schemes, draw a block diagram of the MAC and then indicate how
many levels of CSA's are needed before carry-propagation adder (CPA)?
why is the answer 4 levels not 3?Assume a 12x12 parallel

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