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OpenStudy (kingj):
What is the sum of the arithmetic sequence 3, 9, 15…, if there are 34 terms?
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OpenStudy (mertsj):
\[\S _{n}=n(\frac{a _{1}+a _{n}}{2})\]
OpenStudy (mertsj):
What is asubn???
OpenStudy (mertsj):
\[a _{n}=a _{1}+(n-1)d\]
OpenStudy (mertsj):
\[a _{34}=3+(33)(6)=201\]
OpenStudy (mertsj):
\[\S _{n}=34(\frac{3+201}{2})=3468\]
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