Find the adjoint of matrix `A=[a_(i j)]=[(p, q),( r, s)]` .

Explanation

To find the adjoint of the matrix \( A = \begin{pmatrix} p & q \\ r & s \end{pmatrix} \), we will follow these steps:

### Step 1: Identify the matrix elements
The elements of the matrix \( A \) are:
- \( a_{11} = p \)
- \( a_{12} = q \)
- \( a_{21} = r \)
- \( a_{22} = s \)
...