For any two matrices \( A \) and \( B \), we have \( \mathrm{P} \) ...

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For any two matrices \( A \) and \( B \), we have
\( \mathrm{P} \)
(1) \( A B=B A \)
(2) \( A B \neq B A \)
W
(3) \( A B=0 \)
(4) None of these
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