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Math Help - generating function

  1. #1
    Junior Member
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    generating function

    I need help with this generating function. Thanks
    sum (2*n choose n)*x^n from 0 to infinity - Wolfram|Alpha
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  2. #2
    MHF Contributor
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    Re: generating function

    what help do you need? What is the question?
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  3. #3
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    Re: generating function

    How did they come up with 1/sqrt(1-4x)?
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