# SOLUTION: Question: Find the sums of the following geometric series. 1 + 3 + 9 +...+2187. What I've tried so far... So: know:a=1 r=3 tn=2187 find:??? For this

Algebra ->  Algebra  -> Sequences-and-series -> SOLUTION: Question: Find the sums of the following geometric series. 1 + 3 + 9 +...+2187. What I've tried so far... So: know:a=1 r=3 tn=2187 find:??? For this      Log On

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 Algebra: Sequences of numbers, series and how to sum them Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Sequences-and-series Question 247854: Question: Find the sums of the following geometric series. 1 + 3 + 9 +...+2187. What I've tried so far... So: know:a=1 r=3 tn=2187 find:??? For this problem, wouldn't I have to find how many terms are in the sequence first? Then whatever n is, I plug that into another equation? I'm so lost...please help!Answer by mathitutor(25)   (Show Source): You can put this solution on YOUR website!This is a standard geometric progression, 3^0 + 3^1 + 3^2 + ... + 3^7 There is a standard formula for summation of terms of a geometric progression series. Use that to solve this.