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Thread: Simple permutation question

  1. September 10th 2009, 05:26 PM #1
    chengbin
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    Simple permutation question

    Why is _nC_0=1?
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  2. September 10th 2009, 05:34 PM #2
    pickslides
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    As 0! = 1 then

    <br /> ^nC_0 = \frac{n!}{0!(n-0)!}= \frac{n!}{n!}= 1<br />
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