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If the nth term of the A.P. 9, 7, 5, ...... is same as the nth term of the A.P. 15, 12, 9, ...... find n. |
Answer» A = 9, D = 7- 9 = - 2 a = 15, d = - 3 An = an A+(n - 1)D = a +(n -1)d 9 – (n -1)2 = 15 – (n -1)3 (n -1)(3 - 2) = 6 n - 1 = 6 n = 7 |
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