Răspuns:
A={x€N*|x<5}
B={x€N|3_<x<10}
A={1,2,3,4}
B={3,4,5,6,7,8,9}
AUB={1,2,3,4,5,6,7,8,9}
A^B={3,4}
A-B={1,2}
B-A={5,6,7,8,9}
(A^B)-{1,3,5,7,9}
{3,4}-{1,3,5,7,9}={4}
