**Problem : **
Let set *A* = {1, 2, 3} and set *B* = {4, 5}. What is their Cartesian
product *A*×*B*?

**Problem : **
What is the Cartesian product of the set of real numbers and itself?

**Problem : **
What is the Cartesian product of the set of positive real numbers with itself?

**Problem : **
What is the domain and range of the relation {(2, 4),(4, 8),(8, 16)}?

**Problem : **
What is the domain and range of the relation *y* = ±?

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