Because if you consider the perimeter streets then the blocks inside are (# streets-1). It is the same if you draw a square with 4 vertical lines and 3 horizontal lines; the sectors in the square are 3*2 (# vertical lines - 1)*(#horizontal lines -1)
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Anonymous A
on Sep 15, 2019
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why did we subtract one from the number of streets and avenues as we calculated the number of blocks?
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Anonymous B
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