1. Найдите A ∪ B, A ∩ B, A \ B, B \ A.

A = {3, 6, 9, 12, 15, 18}, B = {2, 4, 6, 8, 10, 12, 14, 16, 18}. A ∪ B = {2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18}, A ∩ B = {6, 12, 18}, A \ B = {3, 9, 15}, B \ A = {2, 4, 8, 10, 14, 16}.