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  Harmonic Progression :
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If inverse of a sequence follows rule of an A.P. then it is said to be in harmonic progression.
 
        e.g. 1,1/2, 1/3, 1/4, 1/5 ...............
 
              1/10, 1/7, 1/4, 1, – 1/2, ...........
 
In general
 
        1/a, 1/a+d, 1/a+2d, ..................
 
Note:
 
Three convenient numbers in H.P. are

        1/a–d, 1/a, 1/a+d

Four convenient numbers in H.P. are

        1/a–3d, 1/a–d, 1/a+d, 1/a+3d

 
Five convenient numbers in H.P. are
 

        1/a–2d, 1/a–d, 1/a, 1/a+d, 1/a+2d

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