Stabiliti valoare de adevar a propozitilor : b) (1,7,9) inclus (0,1,6,7,8) c) 3 nu apartine lui (4,7,11) d) (0) =n/n steluta ; e) 4 apartine (1,2,4) intersectie (5,6,2,1) f) (12,13,14) intersectie (1,2,3,4) = multime vida