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Math Help - Find the limit

  1. #1
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    Find the limit

    a_n=\frac {2\cdot 2}{1\cdot 3}\cdot\frac {4\cdot 4}{3\cdot 5}\cdot\ldots\cdot\frac {2n\cdot 2n}{(2n-1)\cdot (2n+1)}
    What's the limit?
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  2. #2
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    Quote Originally Posted by james_bond View Post
    a_n=\frac {2\cdot 2}{1\cdot 3}\cdot\frac {4\cdot 4}{3\cdot 5}\cdot\ldots\cdot\frac {2n\cdot 2n}{(2n-1)\cdot (2n+1)}
    What's the limit?
    Read this: Wallis Formula -- from Wolfram MathWorld
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