# MDM4U Homework/Quiz – 2015-09-15

We learned about Factorial Notation and about Permutations today:

Factorial: $n!=n\times(n-1)\times\ldots\times2\times1$

Number of permutations of $n$ distinct objects: $_nP_n = P(n,n) = n!$

Tomorrow we’ll practice the notation a bunch and use it with some example problems.

For tonight, complete the homework quiz I handed out in class. If you missed class or lost your page, here it is: 2015-09-15-OrganizedCountingQuiz