If \( A \neq O \) and \( A \) is singular then \( A^{-1} \) equals ...

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If \( A \neq O \) and \( A \) is singular then \( A^{-1} \) equals to
\( \mathrm{P} \)
(1) \( A \)
(2) \( I \)
W
(3) \( A A^{\prime} \)
(4) Does not exist
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