If \( \mathrm{A} \) and \( \mathrm{B} \) are two matrices of the or...

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If \( \mathrm{A} \) and \( \mathrm{B} \) are two matrices of the order \( 3 \times m \) and \( 3 \times n \), respectively, and \( m=n \), then the order of matrix \( (5 \mathrm{~A}-2 \mathrm{~B}) \) is
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(A) \( m \times 3 \)
(B) \( 3 \times 3 \)
(C) \( m \times n \)
(D) \( 3 \times n \)
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