Fill in the blank:
HCF of two numbers is _____ given that their LCM is 210 and the numbers are 42 and 70.

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Solution

Product of two numbers = HCF $\times$ LCM

$\Rightarrow$ 42 $\times$ 70 = HCF $\times$ 210
$\Rightarrow$ HCF = $\frac{2940}{210}$ = 14

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