For which value of k, inverse does not exist for the matrix $\begin{bmatrix}1 & 2\\k & 6 \end{bmatrix}$ :
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 3
$\begin{bmatrix}1 & 2\\k & 6 \end{bmatrix}=A$
$|A|=6-2k$
for $A^{-1}$ to not exist
$|A|=0⇒k=3$