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How to read/interpret this equation

  1. Nov 11, 2012 #1
    Hi guys,


    I am a little confused about how to interpret the matrix included in the equation...can someone please write it in a single line not using the matrix for let's say n=3...

    Thanks in advance.
  2. jcsd
  3. Nov 11, 2012 #2


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    That's not a matrix, it's a standard notation for a binomial coefficient:

    $$\left(\begin{array}{c}{n \\ k}\end{array}\right) = _nC_k = \frac{n!}{k!(n-k)!}$$
  4. Nov 11, 2012 #3


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    What matrix? Is [itex]\tau[/itex] a matrix? Because [itex]{n \choose k}[/itex] is not a matrix.
  5. Nov 11, 2012 #4
    Thanks so much Mr. Mute..Mr. Mentallic, I thought (n k) is a matrix not tau...sorry...

    Thanks so much for the replies....have a good day guys...
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