Which of the following can't be defined as a set?

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Which of the following can't be defined as a set?

  1. The set of Indian Nobel laureates.
  2. The set of meritorious students of Assam.
  3. The set of even numbers less than 500.
  4. None of the above.
Solution:2
Explanation:
The set of meritorious students of Assam is not a set because the concept of merit differ person to person. I may find X as a meritorious student but you may not find him/her meritorious.

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