Answers

2015-09-22T19:30:30+08:00
All numbers that have a factor of 3 like 9, 12, 15, 18, 21.. 
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2015-09-22T19:33:24+08:00

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 A number is divisible by 3 if the sum of all it's digits are divisible by 3.

Example :
Is 49 divisible by 3?
Let's see. 4 + 9 is 13, but it cannot be divided by 3. So
49 ≠ divisible by 3

Is 60 divisible by 3?
Let's see. 6 + 0 is 6, and it can be divided by 3. So
60 = divisible by 3 
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