Find (A - B) ∪ (B - A), if A = {1, 3, 4} and B = {2, 5, 9, 11} .
{1, 2, 3, 4, 5, 9, 11}
If A = {1, 3, 4} and B = {1, 4, 3, 2} then which of the following is true?