If A and B are two matrices of the order 3 × m and 3 × n, respectively, and m = n, then the order of matrix (2A – 5B) is
Answer & explanation
Correct answer: option 4
Given that, the order of matrix A is 3 × m, and the order of B is 3 × n.
Also, m = n.
So, the order of matrix A and B is the same, i.e. 3 × m.
Thus, subtraction of matrices is possible, and (2A – 5B) also has the same order, i.e. 3 × n.