engineering recuitment NMC JE Civil Mock Test 2024 Engineering Mathematics Set Theory & Algebra

Which one of the following is not correct in respect of the sets A and B?

1
If A ⊆ B, then B ∪ A = B
2
If A ⊆ B, then A ∩ (A − B) = ϕ
3
If A ⊆ B, then B ∩ A = A
4
If A ∩ B = ϕ, then either A = ϕ or B = ϕ
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