Question: Let U denote the set of all students in the business college of a certain university. Let
A = {x ∈ U |x had taken a course in accounting}
B = {x ∈ U |x had taken a course in economics}
C = {x ∈ U |x had taken a course in marketing}
Write the set that represents each statement.
a. The set of students who have had courses in economics but not courses in accounting or marketing
b. The set of students who have had at least one of the three courses
c. The set of students who have had all three courses