Question

a U b a u c b u c a \b a \c zero taiat intersectat cu c

Answer 1

a u b = { 1,2,3,4,6}
a u c ={1,2,3,5,7}
b u c = {2,3,4,6,7}
a\b ={1,3}
a\c={1,2,}
Ф(multimea vida)n c = {3,5,7,Φ}