If \( n(\xi)=40, n(\mathrm{~A})=22, n(\mathrm{~A} \cap \mathrm{B})=8 \) and \( n\left((\mathrm{~...
If \( n(\xi)=40, n(\mathrm{~A})=22, n(\mathrm{~A} \cap \mathrm{B})=8 \) and \( n\left((\mathrm{~A} \cup \mathrm{B})^{\prime}\right)=6 \), determine \( n(\mathrm{~B}) \)
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