Question

find the sum of 7 terms of the g p 3,6,12.....​

Answer 1

Step-by-step explanation:

t1=3,t2=6,t4=12

tn=a+(n-1)×d

Answer 2

The sum of 7 terms of the G.P. 3,6,12.....​ is 381

Step-by-step explanation:

The given G.P. series is 3, 6, 12.....

Here, a= 3 and r=2

Sum of finite G.P. series is given by

$\Rightarrow  S= a \times\frac{r^{n}-1}{r-1}$

$\Rightarrow  S= 3 \times\frac{2^{7}-1}{2-1}$

$\Rightarrow  S= 3 \times\frac{127}{1}$

$\Rightarrow  S= 381$

The sum of 7 terms of the G.P. 3,6,12.....​ is 381