$$\therefore$$ There can be infinitely many $$B's$$
for which $$AB=BA$$
4
AIEEE 2006
MCQ (Single Correct Answer)
If $$A$$ and $$B$$ are square matrices of size $$n\, \times \,n$$ such that
$${A^2} - {B^2} = \left( {A - B} \right)\left( {A + B} \right),$$ then which of the following will be always true?