Let A = {Dirk, Johan, Frans, Sarie}, B = {Frans, Sarie,

Last updated: 7/12/2022

Let A = {Dirk, Johan, Frans, Sarie}, B = {Frans, Sarie, Tina, Klaas, Henrika}, C = {Hans, Frans}. Does n(CUB) = n(C) + n(B) - n(Cn B)? Yes No