Question

find the sum of 8 terms of the gp 1, 3 ,9. ,27.........​

Answer 1

Answer:

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Answer 2

Answer:

The given G.P is :

1,3,9,27,...............upto n terms

Here,

a = 1 and r = 9/3 =3

We know that ,

Sn = a[r^n -1]

_______

r-1

So,

S8 = 1[ 3⁸ -1]

_______

3-1

= 3⁸ -1

____

2

= 6561 - 1

______

2

= 6560

_____

2

S8 = 3280

Therefore,

Therefore,The sum of the first 8 terms of the given G.P. is 3280.