Suppose that $A$ is the set of sophomores at your school and $B$ is the set of students in discrete mathematics at your school. Express each of these sets in terms of $A$ and $B$ .
- the set of sophomores taking discrete mathematics in your school
- the set of sophomores at your school who are not taking discrete mathematics
- the set of students at your school who either are sophomores or are taking discrete mathematics
- the set of students at your school who either are not sophomores or are not taking discrete mathematics