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If a,d and Sn are first term, common difference and sum of first nth terms of se

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If a,d and Sn are first term, common difference and sum of first nth terms of series, then Sb =



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2) Sum of n terms of G.P is

3) If a = 3, r = 2, then nth term of G.P is

4) 5th term of G.P 3,6,12,… is

5) G1,G2,…,Gn are said to be n geometric means between a and b if a,G1,…Gn,b is

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