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Homework Help: Summation formula help

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


  4. Sep 10, 2012 #3

    Simon Bridge

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    Science Advisor
    Homework Helper

    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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