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If the nth term of the AP -1, 4 ,9 14 ............. is 129 find the value of n. |
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Answer» Givena = -1an = 129d = 5We know that, an = a + (n-1)d129 = -1 + (n-1)5130 = 5(n-1)n-1 = 130/5n-1 = 26*n = 27* N=27 |
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