We have, a = 10 , d = (8 - 10) = -2, Tn = - 28 Tn = a + (n - 1)d ⇒ -28 = 10 + (n - 1) x (- 2) ⇒ -28 = 10 - 2n + 2 ⇒ 2n = 12 + 28 ⇒ 2n = 40 ∴ n = 20
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