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What is harmonic sequence all about?

Sagot :

A sequence whose reciprocals form an arithmetic sequence is called a harmonic sequence.
Example:
  1, ½, 1/3, ¼…                
The reciprocal form an arithmetic sequence
. In the harmonic sequence 2/3, ½, 2/5, 1/3, 2/7…               
 
We can say that ½ is the harmonic means between 2/3 and 2/5; ½, 2/5 and 1/3 are the harmonic between 2/3 and 2/7.
  2/3+1/2+2/5+… is a harmonic series.