\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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If \(n \mid a\) and \(a \mid n\) for two positive integers \(a>0\) and \(n>0\), then:
\(a = n\)
\(a = -n\)
\(a = 1\) and \(n = 1\)
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