What values are in the range of $f(x) = ax \: (\text{mod } m)$ for $x \in \{0,...,m-1\}$.
I know that the answer should be all multiples of d however I'm not sure how one would reach that conclusion
2026-04-04 00:21:05.1775262065
$f(x) = ax \text{ mod } m$, given that $\text{gcd}(a,m) = d$ what values does $f(x)$ take on?
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