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How do I determine the value of a series i.e. $S_n$?
in Mathematics by Wooden (4,853 points)
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The expression next to the $\Sigma$ sign is the general term, $T_n$ will help you to determine $a$ and $d$ or $r$.

where $a$ is the first term, $d$ is the common difference and $r$ is the common ratio.
by Wooden (4,853 points)

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