engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Mathematics Matrices Types of Matrices
If A and B are square matrices of order 2 such that det(AB) = det(BA), then which one of the following is correct?
1
A must be a unit matrix.
2
B must be a unit matrix.
3
Both A and B must be unit matrices.
4
A and B need not be unit matrices.