[tex]\boxed{\bold{card(A\cap B)=cardA+card B-card(A\cup B)}}\\\text{sa tii minte fomula asta:}\\\text{In cazul de fata:}\\card(A\cap B)=19+15-29= 34-29=5[/tex]
card A∩B = card A + card B - card A∪B = 19+15-29= 34-29 = 5
