B − A contains elements that belong to B but not to A.
2
Combine set A with the elements of B that are not already in A.
Answer: A $∪$ (B - A) = A $∪$ B
Reason: Adding B − A to set A includes all elements of A together with the remaining elements of B that are not already in A. Thus, the resulting set contains every element of A or B. Therefore, A $∪$ (B − A) = A $∪$ B
