\( A \) is a set containing \( n \) elements. \( A \) subset \( P \...

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\( A \) is a set containing \( n \) elements. \( A \) subset \( P \) of \( A \) is chosen. The set \( A \) is reconstructed by replacing the elements of \( P \). A subset \( Q \) of \( A \) is again chosen. The
\( \mathrm{P} \) number of ways of chosen \( P \) and \( Q \) so that \( P \cap Q=\phi \) is
(A) \( 2^{2 n}-{ }^{2 n} C_{n} \)
(B) \( 2^{n} \)
W
(C) \( 2^{n}-1 \)
(D) \( 3^{n} \)
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