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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 308, 304, 300, ..., if there are 25 terms? Choose one answer. a. 6,450 b. 6,475 c. 6,500 d. 6,525
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OpenStudy (oaktree):
The formula is \[S = (n/2)(a _{1}+a _{n})\]
OpenStudy (anonymous):
I still have no clue..sorry
OpenStudy (anonymous):
Does anybody know how to do this?
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