If \( n(\mathrm{~A})=20, n(\mathrm{~B})=18 \) and \( n(\mathrm{~A} \cap \mathrm{B})=5 \), calcul...
If \( n(\mathrm{~A})=20, n(\mathrm{~B})=18 \) and \( n(\mathrm{~A} \cap \mathrm{B})=5 \), calculate \( n(\mathrm{~A} \cup \mathrm{B}) \)
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