Which option correctly describes L = {2, 3, 5, 7, 11}?
Answer and explanation
Correct answer: Prime numbers less than 12
The governing concept is identifying a set by a common number property. Each listed number—2, 3, 5, 7, and 11—has exactly two positive divisors, 1 and itself, so each is prime; all are also less than 12. These are precisely the prime numbers below 12. Option B would additionally include 1 and 9, C describes a different parity class, and D lists 1, 2, 3, 4, 6, and 12. Therefore A is correct.
Frequently asked questions
What is the correct answer to this question?
Prime numbers less than 12
Why is this the correct answer?
The governing concept is identifying a set by a common number property. Each listed number—2, 3, 5, 7, and 11—has exactly two positive divisors, 1 and itself, so each is prime; all are also less than 12. These are precisely the prime numbers below 12. Option B would additionally include 1 and 9, C describes a different parity class, and D lists 1, 2, 3, 4, 6, and 12. Therefore A is correct.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems. Topic: General chapter practice.
