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Find harmonic mean {12,17,20}

Your problem `->` harmonic mean {12,17,20}

HM `=N/( 1/X_1 + 1/X_2 + 1/X_3 )`

`=3/( 1/12 + 1/17 + 1/20 )`

After solving, we get
HM `=15.6122`

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