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

Homework Help: Geometric series/geometric progression

  1. Jan 5, 2007 #1
    I can't figure this out for the life of me:

    A geometric series exists with the third term of 8 and the sixth term of 128, what is the geometric series?
     
  2. jcsd
  3. Jan 5, 2007 #2

    Hurkyl

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Have you tried anything at all? What do you know about geometric series?
     
  4. Jan 6, 2007 #3

    HallsofIvy

    User Avatar
    Science Advisor

    In particular, do you know the formula for the nth term of a geometric sequence? Use that formula knowing that a3= 8 and a6= 128 to get two equations in the two parameters you need.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook