Posted by Alexis on Friday, May 27, 2011 at 5:48pm.
Find the sum of the infinite series 1/3+1/9+1/27+... if it exists

Algebra 2  Reiny, Friday, May 27, 2011 at 7:34pm
this is a GS where
a = 1/3
r =1/3
sum(infinite # of terms) = a/(1r)
= (1/3)/(1  1/3)
= (1/3) / (2/3)
= (1/3)(3/2)
= 1/2