Question

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
(a) $m\times 3$ (b) $3\times 3$ (c) $m\times n$
(d) $3\times n$

Answer 1

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