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Answers for “使用 GCD 的 LCM(a,b) 通用公式是什么？”

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The least common multiple (LCM) of two positive integers is equal to their product if and only if the two integers are coprime, meaning their greatest common divisor (GCD) is 1.

Conditions: The two integers are positive.; The two integers are coprime (gcd(a,b) = 1).

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