Comprehension
\( \mathrm{A} \) is a set conatining \( n \) elements. A subset \( P \) of \( \m... VIDEO
Comprehension
\( \mathrm{A} \) 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 \( P \cup Q \) contains exactly \( r \) elements, with \( 1 \leq r \leq n \).
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