Which collection is not a mathematical set?
Answer and explanation
Correct answer: Favourite students of a class
A mathematical set must be well-defined: for any object, membership should be decidable without personal opinion. Prime numbers below 50, clock numbers, and positive factors of 12 are objective collections. “Favourite students” can differ from person to person, so its membership is not uniquely determined.
Frequently asked questions
What is the correct answer to this question?
Favourite students of a class
Why is this the correct answer?
A mathematical set must be well-defined: for any object, membership should be decidable without personal opinion. Prime numbers below 50, clock numbers, and positive factors of 12 are objective collections. “Favourite students” can differ from person to person, so its membership is not uniquely determined.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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