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math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymi mathvariant=normalA/mi/math is a set containing \( n \) elements. A subset \( P \) of \( A \) is chosen. The set \( \mathrm{A} \) is reconstructed by replacing the element of \( \mathrm{P} \). A subset \( \mathrm{Q} \) of \( \mathrm{A} \) is again chosen. The number of ways of choosing \( \mathrm{P} \) and \( \mathrm{Q} \) so that \( \mathrm{P} \cap \mathrm{Q} \) \( =\phi \) is:
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