Let’s count. Occupancy problems with compositions

Do your best in trying to solve the following problems. It is normal that this step will take some time, we recommend to perseverate and wait before looking at the complete solution of the exercises in the video or in the pdf below.

(bullet) To multiply polynomials, you can use the following widget:

https://www.wolframalpha.com/input/?i=Expand

Exercise. In how many ways is it possible to distribute 18 mint gum drops to 6 youngsters, if Carlo must receive no more than 5 and Alberto must receive at least 4?