1) In how many ways can I choose 4 different officers (President, Vice President, Treasurer, and Secretary) from a club of 9 people?

2) There are twice as many students in the cooking club as in the drama club. Suppose there are $a$ students in the drama club and $b$ students who are members of both clubs. Find an expression for the total number of students who are in the cooking club or the drama club (or both). Give your answer in simplest form.

Guest Feb 11, 2021