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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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