Finite Math Examples

${}_{2}C_{12}$

Step 1

Evaluate ${}_{2}C_{12}$ using the formula ${}_{n}C_{r} = \frac{n!}{(n - r)! r!}$ .

$\frac{2!}{(2 - 12)! 12!}$

Step 2

Since $r > n$ , it is impossible to select $12$ items from a total of only $2$ possible items.

$0$