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MMLU / Let X be a topological space, and let A, B, and C be nonempty subsets of X such…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Let X be a topological space, and let A, B, and C be nonempty subsets of X such that A c B c C; that is, A is a proper subset of B, and B is a proper subset of C. Which of the following statements is (are) true?
I. If A and C are connected, then B is connected.
II. If A and C are compact, then B is compact.
III. If A and C are Hausdorff, then B is Hausdorff.

choices

  1. I and II only
  2. III only
  3. I and III only
  4. I, II, and III

subject

college_mathematics

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Source and history

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