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Mathematics, 18.10.2019 18:40 growingideas

How many 3x3 squares are in a strip of squares that is 3 squares tall and 20 squares long is it a)20 b)19 c)18 d)17

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How many 3x3 squares are in a strip of squares that is 3 squares tall and 20 squares long is it a)20...
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