If \( Z \) is an idempotent matrix, then \( (I+Z)^{n} \)....

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If \( Z \) is an idempotent matrix, then \( (I+Z)^{n} \)
\( \mathrm{P} \)
(1) \( I+2^{n} Z \)
(2) \( I+\left(2^{n}-1\right) Z \)
W
(3) \( I-\left(2^{n}-1\right) Z \)
(4) None of these


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