# MDM4U Combinations with Restrictions 2016-02-18

Yup, combinations problems when there’s something extra to worry about. Not just the old $\binom{n}{r}$, but something more.

I looked at the first example in the following file, but we completed a simpler version of the second problem. It’ll help you to solve some of the homework, though: Combinations with Restrictions

And here’s the homework: Page 280 #9, 11, 12, 13. You can also do 15 if you like :)