A number is divisible by 3 if the sum of its digits is divisible by three.
For example, 375 is divisible by three because 3+7+5 is 15, which is divisible by 3.
1+0 = 1, which isn't divisible by 3
1+9+9 = 19, same as above
Determine whether or not the first number is divisible by the second number
10,199; 3
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