Solve this following


Suppose $A$ is any $3 \times 3$ non-singular matrix and $(A-3 I)(A-5 I)=0$, where $I=I_{3}$ and $O$ $=\mathrm{O}_{3}$. If $\alpha \mathrm{A}+\beta \mathrm{A}^{-1}=4 \mathrm{I}$, then $\alpha+\beta$ is equal to :

  1. 13

  2. 7

  3. 12

  4. 8

Correct Option: , 4


Solution not required

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