Question: (1) For any positive integer n, n is a multiple of 9 if and only if the sum of the digits of n is a

(1) For any positive integer n, n is a multiple of

(1) For any positive integer n, n is a multiple of 9 if and only if the sum of the digits of n is a multiple of 9. Hint: For any k E N, 10k 1= 99 ... 9 is a multiple of 9

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