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OpenStudy (anonymous):
Find the sum of the first 5 terms of the geometric series -2, -6, -18, …
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OpenStudy (shamim):
Use Sum=a(1-r^n)/(1-r)
OpenStudy (shamim):
Here a=first term
OpenStudy (shamim):
r=ratio
OpenStudy (shamim):
n=5
OpenStudy (shamim):
Sum=?
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