Ononot — If \text{GCD}(a, b) = 12 and \text{LCM}(a, b) = 720, how man

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GCD & LCMhard

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If $\text{GCD}(a, b) = 12$ and $\text{LCM}(a, b) = 720$ , how many possible unordered pairs $\{a, b\}$ exist?