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A⊆B , C⊆D ⇒ A∪C ⊆ B∪D How?
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A⊆B , C⊆D ⇒ A∪C ⊆ B∪D
How?

User Christopher King
by
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1 Answer

2 votes
Not sure how to do this analytically but if you draw a Venn diagram youll see that its true. Sorry I cant help more.
User Veote
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