QuestionLet A=[2767373727−6767−3727].A=\begin{bmatrix}\frac{2}{7}&\frac{6}{7}&\frac{3}{7}\\\frac{3}{7}&\frac{2}{7}&-\frac{6}{7}\\\frac{6}{7}&-\frac{3}{7}&\frac{2}{7}\end{bmatrix}. Choose the correct option for A−1A^{-1}.
