test the following for the divisibility by 3 and 9
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- If the sum of the digits of a number is divisible by 3, then the number is divisible by 3. Some examples of numbers divisible by 3 are as follows. The number 79154 is not divisible by 3 because the sum of its digits 7+9+1+5+4=26 is not divisible by 3.
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