B. Solve for the value of n.
1) Sn = -80, Q1 = ip,
2) Sn = 50, a1 = 4,
3) Sn = -15, ay = 12,
4) Sn = 180, a =
5, m = ? n = ? an = -26, = 16, d= -3, d = 5, 7 n = ?
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