The nCr() Command

Performs the operation "n choose r" using n and r.

nCr(*expr1,expr2*)

**Menu Location**

[Math][Probability][3]

This command works on all calculators.

This performs the operation "n choose r" where *expr1* is n and *expr2* is r.

`:nCr(3,0)`

# Formulas

The formula used to obtain the result is:

(1)\begin{align} \frac{n!}{r!(n-r)!} \end{align}

This is often referenced with Pascal's Triangle and binomial expansion as well as many areas of mathematics.