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3 and 4 .Determinants and Matrices
normal
If $AB = A$ and $BA = B$, then
A$A^2B = A^2$
B$B^2A = B^2$
C$ABA = A$
DAll of the above
Solution
We have $A^2B = A(AB) = AA = A^2$, $B^2A = B(BA) = BB = B^2$,
$ ABA = A(BA) = AB = A$, and $BAB = B(AB) = BA = B$
Standard 12
Mathematics