SOLUTION: Find sum of geometric series: 81+27+9+3....

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Question 367815: Find sum of geometric series: 81+27+9+3....
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
81+27+9+3....=81(1+1/3+1/9+1/27+...)
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S%2F81=1%2Bsum%28%281%2F3%29%5Ei%2Ci=1%2Cinfinity%29
S%2F81=1%2B%281%2F3%29%2F%281-%281%2F3%29%29
S%2F81=1%2B%281%2F3%29%2F%282%2F3%29
S%2F81=1%2B1%2F2
S%2F81=3%2F2
highlight%28S=243%2F2%29