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  3. 34 as we have already said the sets a b...

Question: 34 as we have already said the sets a b...

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34. As we have already said, the sets A, B, and C are mutually disjoint if no two of them have any elements in common; that is, if A n B Ø, AnC , and Bn C 0. a) Show that if A, B, and C are mutually disjoint, then AnBnC- Ø. b) On the other hand, find three sets A, B, and C for which A「I B C-Ø, but that are not mutually disjoint.

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