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OpenStudy (anonymous):
HELP! Question on geometric series, again. Help needed! Attached below.
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OpenStudy (anonymous):
OpenStudy (anonymous):
where r u getting stuck at?
OpenStudy (anonymous):
I just don't know how to find "r"...
OpenStudy (anonymous):
\[a_{n} = a +(n-1)d\] \[S_{n}=\frac{ n }{ 2 }(2a+(n-1))\] u have been given \[S_{5} & a_{5}\] using above general formulae, u will get 2 equations to solve from that u can determine "r"
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