If \( A \) and \( B \) are two sets such that \( n(A-B)=5, n(B-A)=3 \) and \( n(A \cap B)=10 \),...

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If \( A \) and \( B \) are two sets such that \( n(A-B)=5, n(B-A)=3 \) and \( n(A \cap B)=10 \), then find the following :
\( n(\mathrm{~B}) \).
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