Question

card A= 10, card B =8, card (A ∩ B) = 4, Card (AUB) =?, cARD (A\B)=?, Card (b\a)=?

Answer 1

daca  card(A n B)=4  inseamna ca card A=10=6+4 
                                                          card B=  8=4+4
card(A U B)=6+4+4=14 ;
card(A \  B) =6 ;
card(B \ A)  =4 ;