Răspunsuri

2014-09-12T19:22:32+03:00
Card(A)-nr de elemente al multimii A
Card(A)=?
Card(A U B)=card(A) +card(B)-card(A intersectat cu B)
⇔120=card(A)+100-32⇔120=card(A) +68⇔card(A)=120 -68 ⇔card(A)=32