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$H_{1}, H_{2} are \underline{\underline{H . M}'s} between a, b then \frac{H_{1} + H_{2}}{H_{1} H_{2}} =$

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Correct option is B

1H1+1H2=1a+1b⇒H1+H2H1H2=a+bab

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H1,H2 are H.M_ 's _ between a, b then H1+H2H1H2=

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$H_{1}, H_{2} are \underline{\underline{H . M}'s} between a, b then \frac{H_{1} + H_{2}}{H_{1} H_{2}} =$