Ответ:

В множестве U: I = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20}, а J = {11, 12, 13, 14, 15, 16, 17, 18, 19, 20}.

  1. I ∪ J = {2, 4, 6, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}.
  2. I ∩ J = {12, 14, 16, 18, 20}.
  3. I \ J = {2, 4, 6, 8, 10}.