Question

a) Daca A=13,card B=21 si card (AUB)=33,sa se afle card (A intersectat cu B);b) Daca card B=100,card(A interesctat cu B)=13 si card (AUB)=1987,sa se afle card A;c) Aflati card A si card B daca card(Aintersectat B)=4,card(A\B)=2 si card (AUB)=9...Repedee

Answer 1

a) card(AnB) = Card A + Card B - Card (AUB) = 13+21-33=34-33 = 1 
b) card(AnB) = Card A + Card B - Card (AUB)
13= Card A +100 -1987
Card A = 13+1987-100
Card A = 2000-100=1900

c) Card A = 4+2=6
4= 6+CardB -9
4+9-6=Card B
13-6=Card B
Card B = 7