Question

fie A si B doua multimi.Daca: a) card(A reunit cu B)=10,cardA=5 si cardB=7,calculati card (A intersectatB) b)card A=10 si card (A diferent B)=4,calculati card (A intersectat B). c)B este o submultime a lui A,calculati (A intersectat cu B)

Answer 1

a) card(A intersectat B)=card(A)+card(B)-card(A reunit B)
    card(A intersectat B)=5+7-10
    card (A intersectat B)=12-10
     card (A intersectat B)=2

b) card(A intersectat B)=card(A)-card(A\B)
     card(A intersectat B)=10-4
     card(A intersectat B)=6

c) card(A intersectat B)=card(B)