Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Mathematics Matrices Adjoint and Inverse of a Square Matrix
If \(A=\left[\begin{array}{cc} 5 a & -b \\ 3 & 2 \end{array}\right]\) and \(A \operatorname{adj} A=A A^{t}\), then 5a + b is equal to
1
5
2
-1
3
4
4
13