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Let there be an A.P. with first term 'a', common difference 'd'. If an denotes in nth term and Sn the sum of first n terms, find.(i) n and Sn, if a = 5, d = 3 and an = 50.(ii) n and a, if an = 4, d = 2 and Sn = −14.(iii) d, if a = 3, n = 8 and Sn = 192.(iv) a, if an = 28, Sn = 144 and n= 9.(v) n and d, if a = 8, an = 62 and Sn = 210(vi) n and an, if a= 2, d = 8 and Sn = 90. |
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Answer» Let there be an A.P. with first term 'a', common difference 'd'. If an denotes in nth term and Sn the sum of first n terms, find. (i) n and Sn, if a = 5, d = 3 and an = 50. (ii) n and a, if an = 4, d = 2 and Sn = −14. (iii) d, if a = 3, n = 8 and Sn = 192. (iv) a, if an = 28, Sn = 144 and n= 9. (v) n and d, if a = 8, an = 62 and Sn = 210 (vi) n and an, if a= 2, d = 8 and Sn = 90. |
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