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Solve this following

Question:

If $P=\left[\begin{array}{lll}1 & \alpha & 3 \\ 1 & 3 & 3 \\ 2 & 4 & 4\end{array}\right]$ is the adjoint of a $3 \times 3$ matrix $A$ and $|A|=4$, then $\alpha$ is equal to

  1. 4

  2. 11

  3. 5

  4. 0


Correct Option: , 2

Solution:

 

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