Multiple choice

Let $A = \begin{bmatrix} \ 2 & -0.1 \ \ 0 & 3 \ \end{bmatrix} \hspace{0.2cm} and \hspace{0.2cm} A^{-1}\begin{bmatrix} \ \frac{1}{2} & a \ \ 0 & b \ \end{bmatrix}$, then (a + b) =

  1. $\dfrac{7}{20}$
  2. $\dfrac{3}{20}$
  3. $\dfrac{19}{60}$
  4. $\dfrac{11}{20}$
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Explanation

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