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Summation formula help

  1. Sep 10, 2012 #1
    whats the summation of a^n for a>1 over summation n=0 to N
    thanks.
     
  2. jcsd
  3. Sep 10, 2012 #2
    Hint: for [itex]\,r\neq 1\,[/itex] a constant, we have

    $$\sum_{n=0}^mr^n=\frac{r^{m+1}-1}{r-1}$$

    DonAntonio
     
  4. Sep 10, 2012 #3

    Simon Bridge

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    This is the sort of thing most people just look that up - do you need to work out the formula or what?
     
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