Răspuns:
Explicație pas cu pas:
A = {1, 2, 3, 4, 5, 6, 7}
B = {5, 6, 7, 8, 9}
C = {1, 2, 3, 7, 12}
A U B = {1, 2, 3, 4, 5, 6, 7, 8, 9}
A U C = {1, 2, 3, 4, 5, 6, 7, 12}
B U C = {1, 2, 3, 5, 6, 7, 8, 9, 12}
A ∩ B = {5, 6, 7}
A ∩ C = {1, 2, 3, 7}
B ∩ C = {7}
A U B U C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 12}
A ∩ B ∩ C = {5, 6, 7} ∩ {1, 2, 3, 7, 12} = {7}
A \ B = {1, 2, 3, 4}
B \ C = {5, 6, 8, 9}
A \ C = {4, 5, 6}
A U (B ∩ C) = {1, 2, 3, 4, 5, 6, 7} U {7} = {1, 2,3 ,4 ,5 ,6, 7}
