दिखाइए कि यदि , तो .
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Step-by-step explanation:
दिया है -
A ⊂ B , C - B ⊂ C - A सिद्ध करना है ?
माना कि x ∈ C - B
⇒ x ∈ C लेकिन x ∉ B
⇒ x ∈ C लेकिन x ∉ A [ A ⊂ B ]
⇒ x ∈ C - A
अतः C - B ⊂ C - A
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