For the matrix $A = \left( \begin{array} { r r } 1 & - 2 \\ 0 & 1 \end{array} \right)$, what is the sum of all components of the inverse matrix $A ^ { - 1 }$? [2 points] (1) 5 (2) 4 (3) 3 (4) 2 (5) 1
For the matrix $A = \left( \begin{array} { r r } 1 & - 2 \\ 0 & 1 \end{array} \right)$, what is the sum of all components of the inverse matrix $A ^ { - 1 }$? [2 points]\\
(1) 5\\
(2) 4\\
(3) 3\\
(4) 2\\
(5) 1