If $A$ and $B$ are two sets,then $A \times B = B \times A$ if and only if

If $A, B$ and $C$ are any three sets,then $A \times (B \cup C)$ is equal to

Let $A$ and $B$ be two sets containing $4$ and $2$ elements respectively. Then the number of subsets of the set $A \times B$ each having at least $3$ elements is:

If $A=\{2,4\}, B=\{3,4,5\}$,then $(A \cap B) \times (A \cup B) =$

If $A \times B = \{(a, x), (a, y), (b, x), (b, y)\}$,find $A$ and $B$.

Let $A = \{1, 2, 3, 4, 5\}$ and $B = \{2, 3, 6, 7\}$. Then the number of elements in $(A \times B) \cap (B \times A)$ is