Offline paper
Mathematics · 2013
JEE Main 2013 · 2013-04-07 Offline · Q6
If P= [1, α, 3; 1, 3, 3; 2, 4, 4] is the adjoint of a 3 × 3 matrix A and | A |=4, then α is equal to:
If $\displaystyle P=\left[\begin{array}{lll}1 & \alpha & 3 \\ 1 & 3 & 3 \\ 2 & 4 & 4\end{array}\right]$ is the adjoint of a $\displaystyle 3 \times 3$ matrix A and $\displaystyle |\mathrm{A}|=4$, then $\displaystyle \alpha$ is equal to :
Official answer
(3)
$\displaystyle 11$
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JEE Main 2013 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.