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1. |
Find the number of terms of the A.P. 41, 38, 35, ..., 8? |
Answer» Here, a = 41 , d = 38 – 41 = –3 and l = 8 where l = a + (n – 1)d ⇒ 8 = 41 + (n – 1)(–3) ⇒ 8 = 41 –3n + 3 ⇒ 8 = 44 – 3n ⇒ 8 – 44 = –3n ⇒ –36 = –3n ⇒ n = -36/-3 = 12 Hence, the number of terms in the given AP is 12 |
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