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Question
If A and B are subsets of the universal set U, then show that A ⊂ A ∪ B
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Solution
A and B are subsets
To prove: A ⊂ A ∪ B
Proof: Let x ∈ A
⇒ x ∈ A or x ∈ B
⇒ x ∈ A ∪ B
⇒ A ⊂ A ∪ B
Hence Proved
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