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Suppose, if A and B are two non-empty sets, then the Cartesian product of two sets, A and set B is the set of all ordered pairs (a, b) such that a ∈A and b∈B which is denoted as A × B.
The Cartesian product A × B consists of all the ordered pairs of the form (a, b), where a is a student at the university and b is a course offered at the university.
One way to use the set A × B is to represent all possible enrollments of students in courses at the university