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Homework Help: Summation formula help

  1. Sep 10, 2012 #1

    amaresh92

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    whats the summation of a^n for a>1 over summation n=0 to N
    thanks.
     
    amaresh92, Sep 10, 2012
  2. jcsd
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  3. Sep 10, 2012 #2

    DonAntonio

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    Hint: for [itex]\,r\neq 1\,[/itex] a constant, we have

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

    DonAntonio
     
    DonAntonio, Sep 10, 2012
  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?
     
    Simon Bridge, Sep 10, 2012
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