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Find S-n for the arithmetic series in which a1 = -11, A-n=13, and n=7?

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Find S-n for the arithmetic series in which a1 = -11, A-n=13, and n=7?

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  1. S-n = (a1 + A-n)/2  * n=7*(-11 + 13)/2 =  -7.

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