Which option is the roster form of E={x: x is a prime digit}?
Answer and explanation
Correct answer: E={2,3,5,7}
A prime number has exactly two positive divisors, 1 and itself. Among the digits 0 through 9, the prime digits are 2, 3, 5, and 7, so option A is the correct roster form. Zero and 1 are not prime; including 1 causes the error in B. Option C lists even composite digits, while D includes 9, which is composite, and omits 2.
Frequently asked questions
What is the correct answer to this question?
E={2,3,5,7}
Why is this the correct answer?
A prime number has exactly two positive divisors, 1 and itself. Among the digits 0 through 9, the prime digits are 2, 3, 5, and 7, so option A is the correct roster form. Zero and 1 are not prime; including 1 causes the error in B. Option C lists even composite digits, while D includes 9, which is composite, and omits 2.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems. Topic: General chapter practice.
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