(Test for Divisibility by 11) Let n be an integer with
Chapter 15, Problem 32E(choose chapter or problem)
(Test for Divisibility by 11) Let n be an integer with decimal representation akak–1 ··· a1a0. Prove that n is divisible by 11 if and only if a0 – a1 + a2 – ··· (–1)kak is divisible by 11.
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