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OpenStudy (anonymous):
find a(n) for the following geometric sequence a(1)=3,r=-3
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OpenStudy (anonymous):
a(n) = 3*(-3)^(n-1)
OpenStudy (anonymous):
3/4 1/(1-(-3)) or sum of \[\sum_{1}^{\infty}1(-3)^n\] don't know what you are looking for
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