If \( A \) is an invertible matrix, then which of the followings ar...

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If \( A \) is an invertible matrix, then which of the followings are true:
(a) \( A \neq O \)
(b) Adj. \( A \neq O \)
(c) \( |A| \neq 0 \)
(d) \( A^{-1}=|A| \operatorname{Adj} . A \).
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