P&C 2102: choosing a group

In this question, we choose a group of $n$ students from a set of $m$ students, split between schools $A,B$ and $C$, with the following restrictions:

• $a$ students from $A$, $b$ students from $B$ and $c$ students from $C$
• students from $B$ and $C$ only
• at least $k$ students from $C$
• at least 1 student from each school

App preview

Access the app at https://2102-gray.vercel.app.