First slide

Operations of matrix

Question

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

Very Easy

A

$3 \times 3$
B

$4 \times 3$
C

$n \times 3$
D

$3 \times n$

Solution

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

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