If $A$ and $B$ are two matrices of the order $3 \times m$ and $3 \times n$, respectively and $m = n$, then order of matrix $(5A - 2B)$ is
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → $3 \times n$ ##
$A_{3 \times m}$ 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 $3 \times n$.