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Some Finite Series Found in Closed-Form

(April 12, 2009 and May 3, 2009)

 For each positive integer n, the following nth partial sums are found in a closed-form.

  • .

 

 

  • .

 

 

  •  .

 

 

  • .  Note that k starts at 2.  If n tends to infinity, it is easy to see this series converges to 1/4.

 

.  Also, there exists another series with a different sign of k, namely

 

.

 

 

  • . (correct)

 

 

  • .

 

 

  • .

 

 

  • .

 

 

  • .

 

 

  • .

 

 

  • .

This finite series is a beautiful identity in which both sides are equal for each positive integer n.  It converges to 25/576 as n tends to infinity. In addition, this series can be transformed into another form, namely 

 

 

or

 

.

 


Other finite series:

Main SMS


In-Text or Website Citation
Tue N. Vu, Some Finite Series Found in Closed-Form, 04/12/2009, from Series Math Study Resource.

 

Success is not final. Failure is not fatal. The courage to continue is what counts.

Winston Churchill