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Because 252 is a multiple of 12, 12 and 252 are one pair (252 = 12 x 21 = 252 x 1)
Another pair is 36 and 84 (252 = 36 x7 and 84 x 3)
252 = 3 x 3 x 4 x 7 = 12 x 3 x 7, so only 36 and 84 are possible multiples of 12.
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