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Homework Help: Geometric logic

  1. Oct 26, 2006 #1
    do you have an explanation to why sometimes the general term formula for geometric sequence is not raised to n-1 but to simply n?
     
  2. jcsd
  3. Oct 26, 2006 #2
    because you could have [tex] \sum_{n=0}^{\infty} ar^{n} [/tex] or [tex] \sum_{n=1}^{\infty} ar^{n-1} [/tex]

    Or [tex] \sum_{n=k}^{\infty} ar^{n-k} [/tex]
     
    Last edited: Oct 26, 2006
  4. Oct 26, 2006 #3
    oh ok...so from what I understood, if the sequence starts at zero then the formula raised to n because if it was n-1 then it will read -1, right?
     
  5. Oct 26, 2006 #4
    that is correct
     
  6. Oct 26, 2006 #5
    all right thank you!
     
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