If \( A=\{\phi,\{\phi\}\} \), then the power set of \( \mathrm{A} \...

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If \( A=\{\phi,\{\phi\}\} \), then the power set of \( \mathrm{A} \) is
(A) \( \mathrm{A} \)
(B) \( \{\phi,\{\phi\}, \mathrm{A}\} \)
(C) \( \{\phi,\{\phi\},\{\{\phi\}\}, \mathrm{A}\} \)
(D) none of these
\( \mathrm{P} \)
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