vera_ewing one year ago .

1. Nnesha

formula to find sum of the geometric sequence $\huge\rm S_n = \frac{ a_1(1-r^n) }{ 1-r }$ r= ratio n= number of term a_1 = first term

2. Nnesha

do you know how to find common ratio ?

3. Nnesha

how did you get that ?

4. Nnesha

yes.

5. Nnesha