Hello everyone,

I was hoping someone could help me with this question. I don't know what questions I need to ask myself in order to set it up. My teacher told my class to think of the worst case scenario in order to be insured that we would get enough books. Below is the problem.

How many books must you choose from among a collection of 7 mathematics books, 18 books of short stories, 12 chemistry books, and 11 physics books to be certain that you have at least 5 books of the same type?

Any help would be greatly appreciated. Thank you for your time