(Test for Divisibility by 3) Let n be an integer with
Chapter 15, Problem 35E(choose chapter or problem)
Problem 35E
(Test for Divisibility by 3) Let n be an integer with decimal representation akak–1 ···a1a0. Prove that n is divisible by 3 if and only if ak 1 ak–1 + ··· + a1 + a0 is divisible by 3.
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