Which roster form is correct for D={x: x is a one-digit even prime number}?
Answer and explanation
Correct answer: D={2}
A prime number has exactly two distinct positive factors: 1 and itself. Among even numbers, every number other than 2 is divisible by 2 and therefore has more than two factors. The number 2 is one digit and is the only even prime. Zero is not prime, so the correct singleton set is option A.
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What is the correct answer to this question?
D={2}
Why is this the correct answer?
A prime number has exactly two distinct positive factors: 1 and itself. Among even numbers, every number other than 2 is divisible by 2 and therefore has more than two factors. The number 2 is one digit and is the only even prime. Zero is not prime, so the correct singleton set is option A.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Common Questions.
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