Which option correctly describes X = {2, 3, 5, 7}?
Answer and explanation
Correct answer: English: X = {x : x is a prime number less than 10} | हिन्दी: X = {x : x, 10 से छोटी अभाज्य संख्या है}
The prime numbers less than 10 are 2, 3, 5, and 7, because each has exactly two positive factors: 1 and itself. Thus the description “x is a prime number less than 10” produces precisely X = {2, 3, 5, 7}. Option B is incomplete because it excludes 2, the only even prime number. Factors of 10 and composite numbers less than 10 produce different sets, so options C and D are incorrect.
Frequently asked questions
What is the correct answer to this question?
English: X = {x : x is a prime number less than 10} | हिन्दी: X = {x : x, 10 से छोटी अभाज्य संख्या है}
Why is this the correct answer?
The prime numbers less than 10 are 2, 3, 5, and 7, because each has exactly two positive factors: 1 and itself. Thus the description “x is a prime number less than 10” produces precisely X = {2, 3, 5, 7}. Option B is incomplete because it excludes 2, the only even prime number. Factors of 10 and composite numbers less than 10 produce different sets, so options C and D are incorrect.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Sets. Topic: Sets and their representations.
