class 12 maths matrices

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

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📘 Matrices NCERT,Exemp,Q.no.57,Page 60 MCQ 1 mark

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

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${A_{3 \times m}}$ and ${B_{3 \times n}}$ are two matrices. If $m = n$, then A and B have same orders as $3 \times n$ each, so the order of $(5A - 2B)$ should be same as $3 \times n$.

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