a1 = -5, d = -4, n = 101, an = ?, -405, a1 = 40, an = 59, d = 1/2, n = ?, 39, an = -17/2, n = 25, d = -3/8, a1 = ?, 1/2, a1 = 25, an = -10, n = 18, d = ?, -2, a1 = -15, d = 6, n = 11, an = ?, 45, 17, ___, 7, 12, 41, ___, ___, 95, 59, 77, 31, ___, ___, 85, 49, 67, a1 = 3, n = 15, d = 3, Sn = ?, 360, a1 = 30, an = 128, n = 50, Sn = ?, 3950.

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