# How to read/interpret this equation

1. Nov 11, 2012

### TheMarksman

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. Nov 11, 2012

### Mute

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

$$\left(\begin{array}{c}{n \\ k}\end{array}\right) = _nC_k = \frac{n!}{k!(n-k)!}$$

3. Nov 11, 2012

### Mentallic

What matrix? Is $\tau$ a matrix? Because ${n \choose k}$ is not a matrix.

4. Nov 11, 2012

### TheMarksman

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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