Useful Formulas
by luimichael, Oct 31, 2007, 12:45 PM
Some useful formulas:
Section 1
Finite Sum
Section 2
Geometry
Section 1
Finite Sum
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,![$ \sum_{k = 1}^{n} \frac 1 {k(k + 1)......(k + m - 1)} = \frac 1 {m - 1} [ \frac 1 {(m - 1)!} - \frac {n!}{(n + m - 1)!}]$](http://latex.artofproblemsolving.com/1/2/d/12d07806cb213bec22e1b10a8360fbed7372be05.png)
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,Section 2
Geometry
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September 2020
March 2019
April 2017
March 2017
November 2007
October 2007
August 2007
June 2006