If A= ( ll 1 & 2 2 & 1 ) and A(adj A)=k 1, then the value of k is - Vidyadip

MCQ

If $A=\left(\begin{array}{ll}1 & 2 \\ 2 & 1\end{array}\right)$ and $A(\operatorname{adj} A)=k 1$, then the value of $k$ is

A
1
B
-1
C
3
✓
-3

✓

Answer

Correct option: D.

-3

-3 [Hint : A(adj A) = |A| ∙ I]

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