engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Mathematics Matrices Adjoint and Inverse of a Square Matrix
For a square matrix A, which of the following properties hold?
1) (A-1)-1 = A
2) \(\det \left( {{A^{ - 1}}} \right) = \frac{1}{{detA}}\)
3) (λA)-1 = λA-1 where λ is a scalar
Select the correct answer using the code given below:1
1 and 2 only
2
2 and 3 only
3
1 and 3 only
4
1, 2 and 3