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OpenStudy (anonymous):
What is the sum of the geometric sequence –4, 24, –144, … if there are 8 terms?
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OpenStudy (anonymous):
the common ratio r = -24/4 = -6 (and 144 / 24 = -6) sum = (-4) * (1 -(-6)^8) -------- 1 - (-6)
OpenStudy (anonymous):
can u finish this off?
OpenStudy (anonymous):
i dont think im getting the right naswer
OpenStudy (anonymous):
you should get 959780
OpenStudy (anonymous):
positive?
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OpenStudy (anonymous):
yes
OpenStudy (anonymous):
aw thanks! :)
OpenStudy (anonymous):
welcome
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