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OpenStudy (anonymous):
What is the sum of the first five terms of the geometric sequence in which a1 = 3 and r = 1/3?
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OpenStudy (cwrw238):
s5 = 3 * 1 - (1/3)^5 --------- 1 - 1/3
OpenStudy (cwrw238):
= 3 (1 - 1/243) / (2/3)
OpenStudy (anonymous):
121/27
OpenStudy (cwrw238):
yup
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