A square matrix \( A \) is called idempotent if \( A^{2} \) equal t...

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A square matrix \( A \) is called idempotent if \( A^{2} \) equal to
\( \mathrm{P} \)
(1) \( A^{3} \)
(2) \( A \)
W
(3) \( A^{4} \)
(4) None of these
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