Question:
If $A$ is an invertible matrix, then $\operatorname{det}\left(A^{-1}\right)$ is equal to
(a) det $(A)$
(b) $\frac{1}{\operatorname{det}(A)}$
(c) 1
(d) none of these
Solution:
(b) $\frac{1}{\operatorname{det}(A)}$
We know that for any invertible matrix $A,\left|A^{-1}\right|=\frac{1}{|A|}$.
Click here to get exam-ready with eSaral
For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.