Sn = sum of first n terms = [a1(1 - rn)] / (1 - r)
S11 = [-4(1 - (-3)11)] / (1 - (-3)) = -4 (1 + 311) / 4 = -177148
Cornelius H.
asked • 08/01/19What is the sum of the first 11 terms of the geometric sequence: -4, 12, -36, 108,...
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