Q. If $A$ and $B$ are invertible matrices then which of the following is not correct?

2151 219 KCETKCET 2021Determinants Report Error

A

$adj A = ∣ A ∣ A^{- 1}$

23%

B

$det (A^{- 1}) = [det (A)]^{- 1}$

28%

C

$(A B)^{- 1} = B^{- 1} A^{- 1}$

15%

D

$(A + B)^{- 1} = B^{- 1} + A^{- 1}$

34%

Solution:

$(A + B)^{- 1} = B^{- 1} + A^{- 1}$