SOLUTION: Find S11 for the geometric series 1+3+9+27+... Iv'e tried tn=3tn-1 and got t11=3^10 and ended up with 59,049.. I'm an online student and my homework is multiple choice, the option

Question 303740: Find S11 for the geometric series 1+3+9+27+...
Iv'e tried tn=3tn-1 and got t11=3^10 and ended up with 59,049.. I'm an online student and my homework is multiple choice, the options are a)84,934 b)88,573
c) 93,198 d) 96,143
Can you help me? I'm not sure what I'm doing wrong or if I am using the wrong formula, help would definitelly be appreciated =]
Thanks, Rissa
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Find S11 for the geometric series 1+3+9+27+...
Iv'e tried tn=3tn-1 and got t11=3^10 and ended up with 59,049.. I'm an online student and my homework is multiple choice, the options are a)84,934 b)88,573
c) 93,198 d) 96,143
Can you help me? I'm not sure what I'm doing wrong or if I am using the wrong formula, help would definitelly be appreciated =]
------------------------
S11 = (1 - 3^11)/(1-3)
= (177147 - 1)/2
= 88573
http://www.math10.com/en/algebra/geometric-progression.html
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