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

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

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

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

3) 5th term of G.P 3,6,12,… is

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

5) Sum of n terms of G.P is