# SOLUTION: Find S(n) for the arithmetic series in which a(1)=-11, a(n)=13, and n=7. Thank you

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 Algebra: Sequences of numbers, series and how to sum them Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Sequences-and-series Question 41932: Find S(n) for the arithmetic series in which a(1)=-11, a(n)=13, and n=7. Thank youFound 2 solutions by venugopalramana, fractalier:Answer by venugopalramana(3286)   (Show Source): You can put this solution on YOUR website!Find S(n) for the arithmetic series in which a(1)=-11, a(n)=13, and n=7. Thank you SN=(N/2){A1+AN}=(7/2)(-11+13)=7 Answer by fractalier(2101)   (Show Source): You can put this solution on YOUR website!The formula for the sum of an arithmetic series is S = (n/2)(a(1) + a(n)) S = (7/2)(-11 + 13) S = (7/2)(2) S = 7