Praca Domowa
1) Wyznacz i An B, A UB, A-B, B-A
a) A= {1,2,3,4,5}, B={6,7,8}
b) A={O,7,12,18,21} , B = {7,22}
c) A= {2,4,6..., 20}, B= 1,3,5,...,19}