If \( A B=A \) and \( B A=B \), then which of the following is/are true?....

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If \( A B=A \) and \( B A=B \), then which of the following
\( \mathrm{P} \)
is/are true?
W
(1) \( A \) is idempotent (2) \( B \) is idempotent
(3) \( A^{T} \) is idempotent (4) None of these


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