The harmonic mean of three numbers $3, 5, 7$ is

2.43

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3.43

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4.43

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5.43

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Solution

The correct option is C $4.43$
Harmonic mean of three numbers $(3, 5, 7)$

$= \frac{3}{\frac{1}{3} + \frac{1}{5} + \frac{1}{7}}$ $= \frac{3}{\frac{71}{105}} = \frac{315}{71} = 4.436$

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