If \( n(\xi)=48 \) and \( n\left(\mathrm{~A}^{\prime} \cup \mathrm{B}^{\prime}\right)=36 \), the...
If \( n(\xi)=48 \) and \( n\left(\mathrm{~A}^{\prime} \cup \mathrm{B}^{\prime}\right)=36 \), then find \( n(\mathrm{~A} \cap \mathrm{B}) \)
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