A choose b

Here is the formula for a choose b: . This is assuming that of course .

Why is it important?

a choose b is the formula for counting the number of ways you can pick b things from a group a things. For example, how many ways can you pick a group of 5 people to do a certain job from 8 people. Using our formula we see that $\frac{8!}{5!(8-5)!}=\frac{8!}{5!(3)!}= frac{\(8)(7)(6)}{3!}=frac{\(8)(7)(6)}{6}=8(7)=42$ (Error compiling LaTeX. Unknown error_msg)