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2024 DMC Mock 10 Problems/Problem 4

Revision as of 20:59, 16 September 2024 by Pateywatey (talk | contribs)
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$n$ must divide both $47-32=15$ and $77-45=30$ because $32\equiv47\equiv77 \pmod n$. $\gcd(15,30)=\boxed{15}$.

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