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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
this is a GS where a = 1/3 r =1/3 sum(infinite # of terms) = a/(1-r) = (1/3)/(1 - 1/3) = (1/3) / (2/3) = (1/3)(3/2) = 1/2
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