Which collection is a well-defined set?
Answer and explanation
Correct answer: Multiples of 4 less than 30
A well-defined set has a membership rule that gives a definite yes-or-no answer. Whether a number is a multiple of 4 and less than 30 can be checked mathematically, so option C is objective. Words such as good, tall, and popular may depend on personal judgement unless exact standards are supplied, so those collections are not well-defined here.
Frequently asked questions
What is the correct answer to this question?
Multiples of 4 less than 30
Why is this the correct answer?
A well-defined set has a membership rule that gives a definite yes-or-no answer. Whether a number is a multiple of 4 and less than 30 can be checked mathematically, so option C is objective. Words such as good, tall, and popular may depend on personal judgement unless exact standards are supplied, so those collections are not well-defined here.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
