X = {2,3,5,7,11,13,17,19}
Y = {10,11,12,13,14,15,16,17,18,19,20}
X объединение Y = {2,3,5,7,10,11,12,13,14,15,16,17,18,19,20}
X пересечение Y = {11,13,17,19}
X = {2,3,5,7,11,13,17,19}
Y = {10,11,12,13,14,15,16,17,18,19,20}
X объединение Y = {2,3,5,7,10,11,12,13,14,15,16,17,18,19,20}
X пересечение Y = {11,13,17,19}