Question
If A = {1, 2, 3} and B = {2, 4}, state the elements of A × A, A × B, B × A, B × B, (A × B) ∩ (B × A).

Answer

$
\begin{aligned}
& A=\{1,2,3\} \text { and } B=\{2,4\} \\
& A \times A=\{(1,1),(1,2),(1,3),(2,1),(2,2),(2,3),(3,1),(3,2),(3,3)\} \\
& A \times B=\{(1,2),(1,4),(2,2),(2,4),(3,2),(3,4)\} \\
& B \times A=\{(2,1),(2,2),(2,3),(4,1),(4,2),(4,3)\} \\
& B \times B=\{(2,2),(2,4),(4,2),(4,4)\} \\
& (A \times B) \cap(B \times A)=\{(2,2)\}
\end{aligned}
$

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