If the set $A$ has $p$ elements, $B$ has $q$ elements, then the number of elements in $A × B$ is
$p + q$
$p + q + 1$
$pq$
${p^2}$
If $R$ is the set of all real numbers, what do the cartesian products $R \times R$ and $R \times R \times R$ represent?
If $A=\{-1,1\},$ find $A \times A \times A.$
If $G =\{7,8\}$ and $H =\{5,4,2\},$ find $G \times H$ and $H \times G$.
If $A \times B=\{(a, x),(a, y),(b, x),(b, y)\} .$ Find $A$ and $B$
Let $A=\{1,2\}$ and $B=\{3,4\} .$ Write $A \times B .$ How many subsets will $A \times B$ have? List them.