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If 21 divides into M then all the factors of 21 must divide into M.

The factors of 21 are 1, 3, 7, 21 (we usually avoid the factor 1 and the number)

So, 3 and 7 must divide into M.

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βˆ™ 15y ago
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Q: If 21 divides into M what else must dive into M?
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