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Mathematics 22 Online
OpenStudy (anonymous):

Prove the following statement: A number is divisible by 3 if and only if the sum of its digits is divisible by 3.

OpenStudy (perl):

you want to prove a0a1a2...an = 0 mod 3 iff a0 + a1 + a2 + ... + an = 0 mod 3

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