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OpenStudy (anonymous):
I NEED HELP WITH ARITHMETIC SERIES a1=19, an=96, s=690
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OpenStudy (anonymous):
15
OpenStudy (anonymous):
can u work it ?
OpenStudy (anonymous):
\[S _{n} = \frac{ n }{ 2}(a _{1}+a _{n})\] See if that will help you
OpenStudy (anonymous):
thank u
OpenStudy (anonymous):
Your welcome :)
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