Let \( \mathrm{A} \) and \( \mathrm{B} \) be two sets such that \( n(\mathrm{~A})=35, n(\mathrm{...
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0Let \( \mathrm{A} \) and \( \mathrm{B} \) be two sets such that \( n(\mathrm{~A})=35, n(\mathrm{~A} \cap \mathrm{B})=11 \) and \( n(\mathrm{~A} \cup \mathrm{B})^{\prime}=17 \). If \( n(\mathrm{U})=57 \), find \( n(\mathrm{~A}-\mathrm{B}) \)
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