Homework Help Forum: math

Posted by Anonymous on Thursday, November 5, 2009 at 11:46pm.

Find the partial sum S_n for a geometric series such that a_{4} = 216, a_{9} = 52488, and n = 10.

• math - drwls, Friday, November 6, 2009 at 5:51am

  I assume that a_{n} ios the nth term of the series. The ratio of successive terms is 3, since (52488/216)^(1/5) = 3 a_{n} = (216/81)* 3^n Add up the first 10 terms for the partial sum S_n

  
  

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