1.

If A ⊂ B, then show that C - B ⊂ C - A

Answer»

Let x ∈ C - B ⇒ x ∈ C but x ∉ B 

⇒x ∈ C but x ∉ A ∵ A ⊂ B 

∴ x ∈ C- A Thus, C - B ⊂ C - A



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