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Problem with sigma notation

  1. May 3, 2007 #1
    must express this series using sigma notation


    i would be extremely grateful for some help

    I know that you use the infinite symbol and it goes above sigma and then n=1 below it.
    i also have used the arithmetic series equations and geometric equations on several other problems but i don't know where to start when the equation doesn't consist of one of these two and when the ratio isn't a constant additive, divisor, subtractor, or multiplicative
    Last edited: May 3, 2007
  2. jcsd
  3. May 3, 2007 #2
    Look at the numbers in the denominators. Do they remind you of something: 1,1,2,6,24,...? (No, it's not the Fibonacci series!) Pay attention to how one number is related to the subsequent one.
  4. May 4, 2007 #3
    As neutrino mentioned the denominator is interesting. Also just a note 0!=1 = 1!. This is the usuall definition.

    [This hint I think really gives the answer away]
  5. May 5, 2007 #4
    Do you know what a factoral is?
  6. May 6, 2007 #5
    Who are you refering too? I was reading this and made me wonder maby I was thinking wrong? I know whats a factorial and in my classes usually 0! is defined to be 1. Which was shown using the binomial theorum as I remember.
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