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harmonic mean

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harmonic mean [här′män·ik ′mēn]
(mathematics)
Fornpositive numbersx1,x2, …,xntheir harmonic mean is the numbern/(1/x1+ 1/x2+ … + 1/xn). Also known as harmonic average.
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Quadratic equations with real coefficients, relations between roots and coefficients, formation of quadratic equations with given roots, symmetric functions of roots, Arithmetic, geometric and harmonic progressions, arithmetic, geometric and harmonic means, sums of finite arithmetic and geometric progressions, infinite geometric series, sums of squares and cubes of the first n natural numbers.
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