\(\begin{equation*} \begin{bmatrix} 1 & 0 & 0 \\ 0 & 1&1\\ 0&-2&4 \end{bmatrix} \end{equation*}\) ;\(\begin{equation*} I = \begin{bmatrix} 1&0&0\\ 0&1&0 \\ 0&0&1 \end{bmatrix} \end{equation*}\)

A^{ −1 } = 1/6(A ^{2 }+cA+dI) where c, d ∈ R, then pair of values (c, d) are _________