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

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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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 full answer

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