If A and B are two square matrices such that $AB=I$, then which of the following is not true?
Answer & explanation
Correct answer: option 4
We have,
$AB=I$
$⇒B^{-1} = A$ and $A^{-1}=B$
$⇒BA=BB^{-1} =I$
Hence, option (4) is not correct.
If A and B are two square matrices such that $AB=I$, then which of the following is not true?
Correct answer: option 4
We have,
$AB=I$
$⇒B^{-1} = A$ and $A^{-1}=B$
$⇒BA=BB^{-1} =I$
Hence, option (4) is not correct.