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A number is divisible by 3 if the sum of its digits is a multiple of 3. For example, 27 = 2 + 7 = 9/3 = 3. Therefore, 27 is divisible by 3.
If the sum of the digits of the number in question is divisible by three, the whole number is divisible by three.

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Q: What is the divisibility rule for 3?
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