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A quick question on Summations.

  • Thread starter psycho2499
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  • #1
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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.
 

Answers and Replies

  • #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.
 
  • #3
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sorry i meant to say 2^n for the eq.
 
  • #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.
 
  • #5
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this is what i get for only half paying attention to what i type. damn finals. 2^k, Sorry bout that
 
  • #6
Dick
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