Answers

  • Brainly User
2014-04-20T16:08:44+05:30
There's a formula 4 it which is given in the maths book.
0
The Brainliest Answer!
2014-04-20T16:09:19+05:30
The formula for sum of G.P is
S_n= \frac{a(r^n-1)}{r-1)}
if r>1
where a is the first term
   r is the common difference
   n is the number of terms
S_n= \frac{a(1-r^n)}{1-r)}
if r<1
S_n= \frac{a}{1-r}
if r<1 and n tends to infinity
1 5 1