A) B
B) A
C) 0
D) 1
Correct Answer: A
Solution :
[a] \[\because AB=A\] ..........(1) \[\And ~BA=B\] ..........(2) On putting the value of A from equation (1) in equation (2), we have \[B(AB)=B\Rightarrow (BA).B=B\Rightarrow B.B=B\Rightarrow {{B}^{2}}=B.\] Hence, option [a] is correct.You need to login to perform this action.
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