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OpenStudy (anonymous):
Find s25 for the following arithmetic sequence -7, -2, 3, 8,...?
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OpenStudy (anonymous):
\[S_n=\frac{ n }{ 2 }[2a_1+(n-1)d]\] S(n)=Sum of n terms in an arithmetic sequence a(1)=first term of the sequence d=common difference
OpenStudy (anonymous):
can you continue from there??
OpenStudy (anonymous):
yes thanks
OpenStudy (anonymous):
you are welcome!...(:
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