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Example
n choose 2 is the number n times n minus 1 over 2.
<MATH> \frac{n (n -1)}{2} </MATH>
Function
choose(n,k)
R - Choose (binomial coefficient)
n choose 2 is the number n times n minus 1 over 2.
<MATH> \frac{n (n -1)}{2} </MATH>
choose(n,k)