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    Working with set theory.

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    Let A, B, and C be sets satisfying: A is included in B,
    B is included in C, and C is included in A. Prove that A = B = C.

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    Solution Preview

    Let x be in A. Then x is in B (since A is a part of B), and
    then x is in C (since B is a ...

    Solution Summary

    A set theory problem is solved. Satisfying sets are included.