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How to find pdf given moment generating function

  1. Jul 15, 2006 #1
    Given that the moment generating function of a random variable is
    (e^t)/(2-e^t) is there a way I can go backwards and find the pdf, or could 2 different pdf's have the same mgf?
  2. jcsd
  3. Jul 22, 2006 #2
    Any bonafide moment generating function always maps to a unique distribution.
    The random variable for the moment generating functi`on that you have given takes values at 1,2,3...infinity with probability 1/2,1/4,1/8...

    ie p(k)=1/2^k for k in natural numbers and zero otherwise.
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