Arithmetic sequence 2 (259:21:24) s100=10 s10=100 Then S110 = how much?

Two methods, this is a simple method, S10 = a1 + ＋a10S100=a1＋…… ＋a100S100-S10=a11+…… +A100 = - 9045 (a11 + A100) = - 90a11 + A100 = - 2s110 = 110 (- 2) / 2 = - 110, so the final value is negative 110. This is the basic method, because if A1 = a, tolerance D, then an = a + (n-1) DS1

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