If A, B, C arc 3 non-empty sets, then (A∩B)∩(B∩C)∩(C∩A) is equal to 

If A, B, C arc 3 non-empty sets, then (AB)(BC)(CA) is equal to 

  1. A

    ABC

  2. B

    ABC

  3. C

    ϕ

  4. D

    None of these

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    Solution:

    (AB)(BC)(CA)=ABC

    The correct answer is 1.

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