Matrices \( A \) and \( B \) will be inverse of each other if \( \m...

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Matrices \( A \) and \( B \) will be inverse of each other if
\( \mathrm{P} \)
(1) \( A B=B A \)
(2) \( A B=B A=O \)
W
(3) \( A B=O, B A=I \)
(4) \( A B=B A=I \)
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