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1 + 2 + 9 = 12 12 is divisible by 3. If the sum of the digits of a number are divisible by 3, then the whole number is divisible by 3. 129 is a composite number because it divisible by a factor other than 1 and itself.

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โˆ™ 2011-09-27 22:33:11
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Q: Is 129 a composite number
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Related questions

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