If $A = \{ \text { Klaas, Johan, Henrika, Sarie } \}$

True/False

If $A = \{ \text { Klaas, Johan, Henrika, Sarie } \}$ and $C = \{ \text { Hans, Henrika } \}$ , then $n ( A \cup C ) = n ( A ) + n ( C ) - n ( A \cap C )$ .