4. Number of elements in the intersections of sets

If \(n(A \cup B \cup C) = 63\), \(n(A) = 38\), \(n(B) = 33\), \(n(C) = 30\), \(n(A \cap B) = 20\), \(n(B \cap C) = 18\), and \(n(A \cap C) = 14\), then find out \(n(A \cap B \cap C)\).

 

\(n(A \cap B \cap C)\) \(=\)