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It's either GCF (Greatest Common Factor) or LCM (Least Common Multiple).

GCF of 3 and 9 is 3, but seven only has 1 as a common factor with the other two, so GCF is 1.

LCM of 3 & 9 is 9, and LCM of 9 and 7 is 7 x 9, so LCM is 63.

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14y ago

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