A sequence is a Harmonic Progression (H.P.) if the reciprocals of its terms form an A.P.
The harmonic mean of (a) and (b) is (H=\dfrac{2ab}{a+b}).
A sequence is a Harmonic Progression (H.P.) if the reciprocals of its terms form an A.P.
The harmonic mean of (a) and (b) is (H=\dfrac{2ab}{a+b}).