The answer the i keep getting for this question is way off of the one in book. Can anyone tell me what i am doing wrong??
for each geometric series, find the indicated partial sum
100+300+900+..... Find S11
here's what I did:
Sn=a(r^n-1)/ r-1
a=100 r=3 n=11
S11=100(3^11-1)/11-1
=100(177146)/10
=17714600/10
=1771460
The answer in the back of the book is:
8857300
What?