Question

How to find the sum to n terms of gp

Answer 1

first Sn terms of a geometric sequence use the formula 
Sn=a1(1−rn)1−r,r≠1
Sn=a1(1−rn)1−r,r≠1,

Answer 2

The sum of first n terms of a geometric sequence is called geometric series.

The formula that is used to calculate is Sn= a1( 1 - rn ).
Where a1 is the first term in the GP. R1 is the common ratio.


Hope my answer is useful to you.