Find harmonic mean of $8, 10$ .

90

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\frac{80}{9}

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9

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5

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Solution

The correct option is B $\frac{80}{9}$
Given:
$8$ and $10$
$H . M . = \frac{2 a b}{a + b} = \frac{2.8.10}{8 + 10} = \frac{80}{9}$

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