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Mathematics
OpenStudy (anonymous):

find a(n) for the following geometric sequence a(1)=3,r=-3

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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