Let ij $\mathrm{S}=\left\{\mathrm{M}=\left[a_{i j}\right], a_{i j} \in\{0,1,2\}, 1 \leq \mathrm{i}_k \mathrm{j} \leq 2\right\}$ be a sample space and $\mathrm{A}=\{\mathrm{M} \in \mathrm{S} ; \mathrm{M}$ is invertible $\}$ be an event. Then $P(A)$ is equal to
