A memory has 8 megabytes of cells (a) What is the size of its MAR? (b) If 2-dimensional addressing is used, what is the size of each of the horizontal and vertical decoders?

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A memory has 8 megabytes of cells
(a) What is the size of its MAR?
(b) If 2-dimensional addressing is used, what is the size of each of the horizontal
and vertical decoders? 

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can you expplain further how to get to that solution? my understanding is if we have 2^24, the row decoder will be 2^12 and column decoder will be 2^12. what happens if the N number is odd? My understanding is that we divide the N bits by 2 but what happens if it's odd 

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