Which of the following is NOT a set?

Which of the following is NOT a set?
  1. Set of intelligent students in class IX
  2. Set of even numbers between $1$ and $10$
  3. Set of letters in the word INDIA
  4. Set of multiples of $3$ less than $20$

Solution

'Intelligent' is not well-defined (subjective). The others are precise.

Asked in: MH-SSC-9

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