Let \( A=\left[\begin{array}{ll}a & b \\ c & d\end{array}\right], a...

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Let \( A=\left[\begin{array}{ll}a & b \\ c & d\end{array}\right], a, b, c, d \neq 0 \), then \( B=A A^{\prime}-A^{\prime} A \) equals
(a) \( (a d-b c) I \)
(b) \( (a c-b d) I \)
(c) \( O \)
(d) none of these
\( \mathrm{P} \)
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