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OpenStudy (anonymous):
What is the sum of a 22–term arithmetic sequence where the first term is 12 and the last term is 201?
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OpenStudy (anonymous):
help!!
OpenStudy (anonymous):
Use the formula \[S _{n}=\frac{ n }{ 2 }\left[ a _{1}+a _{n} \right]\] You know n=22, a_1=12 and a_22=201. So just plug away!
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