Question

A = {1;2;3;7} B - {8;7;1;3}

AuB =

A (U In sus) B =

A-B =

Answer 1

AuB = {1,2,3,7,8}
AUB = {1,2,3,7,8}
A-B = {8}

Answer 2

AUB={1;2;3;7;8}
A-B={2}