\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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According to the properties of the GCD, for any integers \(a, b\) and \(k\), \(\gcd(a, b)\) is always equal to:
\(\gcd(a - kb, b)\)
\(\gcd(a + k, b + k)\)
\(\gcd(ka, b)\)
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