Question

A U B
S=1,2,3,4,5,6,7,8,9
A=1,2,3
B=4,5,6,7,8,9

Answer 1

A U B =GABUNGAN ANTARA A DAN B       
{1,2,3,4,5,6,7,8,9}

Answer 2

A U B = A gabungan B
           = { 1,2,3,4,5,6,7,8,9}