Comprehension A is a set conatining \( n \) elements. A subset \( P \) of \( \mathrm{A} \) cho...

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Comprehension
A is a set conatining \( n \) elements. A subset \( P \) of \( \mathrm{A} \) chosen at random. The set \( A \) is reconstructed by replacing the elements of the subset of \( P \), a subset \( Q \) of A again chosen at random.
Find the probability that \( P \cup Q=\mathrm{A} \) and \( P \cap Q=\phi \) is
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