If A, G, H are arithmetic, geometric and harmonic means between a and b respecti

If A, G, H are arithmetic, geometric and harmonic means between a and b respectively, then A,G,H are

2) 5th term of G.P 3,6,12,… is

3) Sum of n terms of G.P is

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

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