1.Determinati multimile A si B stiind ca sunt indeplinite simultan relatiile:
a) A ∪ B={1,2,3,4,5,,6,7,8,9}
b)B/A-{4,5,6,7,8}
c){3,9}∩ B=∅
d) A∩B={1}
2.Aflati multimile X si Y stiind ca sunt indeplinite simultan urmatoarele conitii:
a)X∩Y={2,3,4,7}
b){1,6,8}∩X=∅
c)X∪A={1,2,3,4,6,7,8}
3.Determinati A si B stiind ca sunt indeplinite in acelasi timp conditiile:
a)A∩B=1,2,3}
b)4∉A
c)A∪B={1,2,3,4}