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OpenStudy (anonymous):
Find S20 for the arithmetic series 8 + 16 + 24 + 32 +...
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OpenStudy (anonymous):
160?
OpenStudy (anonymous):
\[S _{n} = 8+8(n-1)\] since your n is 20, subsitute that into the equation and you get \[S _{20} = 8+8(20-1)\] = 8 + 8(19) =160
OpenStudy (anonymous):
thankssss :)
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