Let $A = \{ \text { Dirk, Tina, Frans, Marie } \}$

Short Answer

Let $A = \{ \text { Dirk, Tina, Frans, Marie } \}$ , $B = \{ \text { Frans, Marie, Tina, Klaas, Henrika } \}$ , $C = \{ \text { Dirk, Frans } \}$ . Find $n ( A \cup ( B \cap C ) )$ .
​ $n ( A \cup ( B \cap C ) ) =$ __________