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13-09-2022
Mathematics

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2. prove or disprove following by giving examples: (15 points) (a) if x ⊂ y and x ⊂ z, then x ⊂ y ∩ z yes (b) if x ⊆ y and y ⊆ z, then x ⊆ z yes (c) if x ∈ y and y ∈ z, then x ∈ z

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