Teaching UP TGT Mock Test Series 2025 Mathematics Sets Operations on Sets

Let A and B be two non-empty subsets of set X. If (A - B) ∪ (B - A) = A ∪ B then which one of the following is correct?

1
A ⊂ B
2
A ⊂ (X - B)
3
A = B
4
B ⊂ A
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