5th term of G.P 3,6,12,… is

5th term of G.P 3,6,12,… is

15

48

2

3

Answer : B

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1) Sum of n terms of G.P is

n/2[2a+(n-1)d]

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

n/2[2a+(n-1)d]

n/2[a+(n-1)d]

n/[2a+(n-1)d]

a+(n-1)d

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

2.3n-1

3.2n

3.2n+1

3.2n-1

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

in G.P

in A.P

in H.P

Real numbers

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

a sequence

not a sequence

G.P

A.P