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

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