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Add the digits of the number together and if the sum is divisible by 3 then the original number is divisible by 3.

The test can be applied to the sum and so the summation can be repeated until a single digit remains; if this digit is 3, 6 or 9 then the original number is divisible by 3.

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โˆ™ 2011-12-22 14:26:46
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Q: What is the divisibility of 3?
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