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