Show that a positive integer is divisible by 3 if and only if the sum of its

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Show that a positive integer is divisible by 3 if and only if the sum of its decimal digits is divisible by 3?

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Discrete Mathematics and Its Applications

ISBN: 978-0073383095

7th edition

Authors: Kenneth H. Rosen

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Question Posted: May 02, 2016 12:23 PM

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Show that a positive integer is divisible by 3 if and only if the sum of its

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Let the decimal expansion of the integer a be given by a a n la n 2 a 1 a 0 10 Thus a 10n1a...View the full answer

Discrete Mathematics and Its Applications

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