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For any practical purpose, it is easier to simply divide, instead of looking for fancy divisibility rules. However, you can apply the divisibility rules for 3 and for 7. This works because (a) their product is 21, and (b) these numbers are relatively prime.

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โˆ™ 2014-08-20 13:35:30
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Q: What is the divisibility rule for 21?
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