Question

Determinati multimile A si B, stind ca sunt indeplinite simultan conditile: a) A ∪ B = (1,2,3,4,5,6,7) b) A ∩ B = (3,5) A-B=(1,6).

Answer 1

Daca A ∪ B = {1,2,3,4,5,6,7} =>{1,2,3,4,5,6,7}∈A sau B
Daca A ∩ B = {3,5} =>{3,5}∈A si B
Daca A-B={1,6} =>{1,6}∈A si {1,6}∉B
=>A={1,2,3,4,5,6}
    B={3,5,7}