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OpenStudy (dumbsearch2):
Given t1 = -23, n = 25, and tn = 57, find the sum of the arithmetic series. A. 125 B. 250 C. 325 D. 425
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OpenStudy (dumbsearch2):
@zarkon @sammixboo
OpenStudy (michele_laino):
Please try this formula: \[S = \frac{{{t_1} + {t_n}}}{2}n\]
OpenStudy (michele_laino):
where S is your sum
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