Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Sum of a Geometric Series

  1. Oct 22, 2008 #1
    If given the values -1, 5, 2 in this sequence, what would be the missing term to make this a geometric series?

    Also, what would the sum of this geometric series be?
  2. jcsd
  3. Oct 22, 2008 #2
    To me, this doesn't look like the terms of a geometric series.

    What is your definition of a "geometric series"?
  4. Oct 22, 2008 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    What geometric series are you talking about? If you mean that a sequence starts -1, 5, 2, ... , that is NOT a geometric sequence: a geometric sequence is either always increasing (if the constant ratio is larger than 1) or decreasing (if it is less than 1).
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Sum of a Geometric Series
  1. Geometric series (Replies: 2)