41. Find the sum of the arithmetic series if an=-70, n = 12, and d =...

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41. Find the sum of the arithmetic series if an=-70, n = 12, and d = 7 S12= S12= -1311 OS12= -1302 S12= -1305 S12= -1315 None of these are correct. 41. Find the sum of the arithmetic series if an=-70, n = 12, and d = 7 S12= S12= -1311 OS12= -1302 S12= -1305 S12= -1315 None of these are correct.