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प्रश्न
For any two sets A and B, prove that
B ⊂ A ∪ B
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उत्तर
For all x ∈ B
⇒ x ∈ A or x ∈ B
⇒ x ∈ A ∪ B (Definition of union of sets)
⇒ B ⊂ A ∪ B
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