Даны множества: a={2,3,8},b={2,3,8,11},c={5,11}.найдите 1)a∩b; a∩c; b∩c; 2)a∪b; a∪c; b∪c.

 1) A∩B = {2, 3, 8};
     A∩C = ∅;
     B∩C = {11};
2)A∪B = {2, 3, 8, 11};
    A∪C = {2, 3, 5, 8, 11};
    B∪C = {2, 3, 5, 8, 11}.