Which of the following is not a well-defined set?
Answer and explanation
Correct answer: Students of a class who find mathematics very easy
A set is well-defined when membership can be decided objectively and unambiguously. Whether a student finds mathematics “very easy” depends on personal feeling and has no fixed numerical or observable boundary. Different people may judge the same student differently. The other options use definite, checkable conditions, so A is not well-defined.
Frequently asked questions
What is the correct answer to this question?
Students of a class who find mathematics very easy
Why is this the correct answer?
A set is well-defined when membership can be decided objectively and unambiguously. Whether a student finds mathematics “very easy” depends on personal feeling and has no fixed numerical or observable boundary. Different people may judge the same student differently. The other options use definite, checkable conditions, so A is not well-defined.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Sets. Topic: Sets and their representations.
