MCQ
If $A$ and $B$ are two sets, then $A × B = B × A$ iff
  • A
    $A \subseteq B$
  • B
    $B \subseteq A$
  • $A = B$
  • D
    None of these

Answer

Correct option: C.
$A = B$
c
(c) In general, $A \times B \ne B \times A$

$A \times B = B \times A$ is true, if $A = B$.

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