Respuesta :

Sum  of n terms  =  a1 *  r^n - 1
                               ---------------
                                  r - 1

a1 = 1/3    and common ratio r = (2/3) / (1/3)  = 2

so sum of  5 terms  =  (1/3) * (2*5 - 1)  /  2-1  =  31/3


This is easily checked by just adding up the 5 terms 
lindsay19
I believe the answer is 31/3

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