Posted by **Elisabeth** on Saturday, November 5, 2011 at 9:21pm.

Find the sum of the first 12 terms of the sequences given in #1.

a.f(n) = 5*(2)^(n-1) ; for n = 1,2,3,4,…

b.a1 = 1/3 ; an+1 = = 3*an

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