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Let there be an A.P. with first term 'a', common difference 'd'. If an denotes its nth term and Sn the sum of first n terms, find. (i) n and Sa, 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. (vii) k, if Sn=3n2+5n and ak=164. (viii) S22, if d =22 and a22 =149 |
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Answer» Let there be an A.P. with first term 'a', common difference 'd'. If an denotes its nth term and Sn the sum of first n terms, find. |
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