The HCF of two numbers is 18 and their product is 12960. Find their LCM.

270

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720

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520

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280

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Solution

The correct option is B 720
For any two numbers a and b,
LCM (a, b) $\times$ HCF (a, b) = $a \times b$
Thus, LCM $\times 18 = 12960$
$\Rightarrow$ LCM = 720

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