Question

Gp find sn
3,6, 12, 24 ....​

Answer 1

Sn = a(r^n-1)/(r-1)

Here, a = 3

r = 6/3 = 2

So, sum of n terms = 3(2^n-1)/(2-1) = 3(2^n-1)

Answer 2

Answer:

Keep smiling.....

Step-by-step explanation:

nth term of a G.P. is given by the following expression:

a_{n} = a{r}^{n - 1}

Here,

a = 3

and,

r = \frac{a_n}{a_n -1}

So,

r = \frac{6}{3} = 2

3072 = 3. {2}^{n - 1}

{2}^{n - 1} = \frac{3072}{3} = 1024

{2}^{n - 1} = {2}^{10}

n - 1 = 10

Therefore,

n = 11