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OpenStudy (anonymous):
What is the sum of the geometric sequence 1, 3, 9, … if there are 12 terms?
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OpenStudy (foolaroundmath):
a = 1 r = 3 n = 12 S = a(r^(n) - 1)/(r-1) = 1*(3^12 - 1)/2 Sum = (3^12 - 1)/2
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