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OpenStudy (anonymous):
What is the sum of a 30-term arithmetic sequence where the first term is 74 and the last term is -100?
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OpenStudy (anonymous):
\[S _{n} = n(a _{1}+a _{n})\over2\]
OpenStudy (anonymous):
Ignore the fact that S_n is on top
OpenStudy (anonymous):
|dw:1339186470194:dw|
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