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OpenStudy (anonymous):
write as a biconditional. when the sum of the digits of an integer is divisible by 9, the integer is divisible by 9 and vice versa.
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OpenStudy (anonymous):
Hm.. Let S(n) be the digit sum for integer n \[S(n) \mid 9 \leftrightarrow n \mid 9 \] \[n \in \mathbb{Z}\]
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