S12 = (2a1 + d*(n - 1))/2 * n = (2*(-16) + 6*11)/2 * 12 = 34 * 6 = 204
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S12 = (2a1 + d*(n - 1))/2 * n = (2*(-16) + 6*11)/2 * 12 = 34 * 6 = 204