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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

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

    HallsofIvy

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    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.
     
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