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  4. If A and B are two matrices of the order 3 × m and 3 × n, respectively, and m = n, then the order of matrix (5A - 2B) is

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

Matrices

Solution:

$A$ is of order $3 \times m$ and $B$ is of order $3 \times n$ and $m = n $
So, $5A - 2B$ is of order $3\times m$ or $3\times n$