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A quick question on Summations.

  1. May 5, 2009 #1
    I can never remember how to expand a summation in to form: [tex]\sum[/tex]nk=1(22). Thats just a recent example. I can't remember the expansion form any sort of summation really except when it has a defined upper bound.
     
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  3. May 5, 2009 #2

    Dick

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    The upper bound is n and the lower bound is 1 isn't it? Looks to me like 4*n.
     
  4. May 5, 2009 #3
    sorry i meant to say 2^n for the eq.
     
  5. May 5, 2009 #4

    Dick

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    Then isn't it n*2^n, or did you mean 2^k? Then it's just a finite geometric sum.
     
  6. May 5, 2009 #5
    this is what i get for only half paying attention to what i type. damn finals. 2^k, Sorry bout that
     
  7. May 5, 2009 #6

    Dick

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