One way is to add or subtract 3, which may provide a number that is more obviously divisible by 3. 72-3=69, so there you go.
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3 is not divisible by 72. 72 is divisible by 3.
72 is a factor of 72, 144, 216 and so on. 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 are the factors of 72.
The factors of 72 are: 36, 2, 24, 3, 18, 4, 12, 6, 9, and 8.
yes 216/9 is 24 216/3 is 72
Add the digits. If the total is divisible by three, the original number is divisible by three. It's not and it's not.