**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* = ±
?