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Re:A Math Problem Generator by vouaobrasil on Sunday December 18, 2022 @11:41PM (#34048569)
It is because a number is base ten is like this:

a + 10b + 100c + 1000d + ....

But 10 leaves a remainder of 1 on division by 3 so this number divided by 3 is the same as

a + b + c + d + ...

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