If \( A, B \) and \( C \) are three square matrices of the same ord...

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If \( A, B \) and \( C \) are three square matrices of the same order, then \( A B=A C \Rightarrow B=C \) if
(a) \( |A| \neq 0 \)
(b) \( A \) is invertible
(c) \( A \) is orthogonal
(d) \( A \) is symmetric
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