Question

Misalkan A = {1,2,3} dan B = {2,1,5} maka (A U B) - A

Answer 1

A U B = {1,2,3,5}
A U B - A = {1,2,3,5}-{1,2,3}
={5}

Answer 2

A U B = { 1, 2, 3, 5 }
 -> ( A U B ) - A = { 1,2, 3 , 5 } - (1, 2, 3}
 = {5}