Ratio - Test : Statement & Proof : Infinite Series #Ratio - #Test #Proof : #Infinite #Series

    D'Alembert's Ratio Test :                      

Statement :                                                                                                          Back

                  If Σ un  is a series of positive terms such that lim (un+1/un) =l, then

                (a)    Σ un converges if l<1 and (b) Σ un diverges if l>1.


Proof : 

          


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