What is the roster form of W = {x : x ∈ N, x is a multiple of 9 and x < 50}?
Answer and explanation
Correct answer: {9,18,27,36,45}
Using natural numbers beginning at 1, the positive multiples of 9 below 50 are 9, 18, 27, 36, and 45. Zero is not included in this natural-number convention, and 54 is greater than 50. The number 9 itself must be included because the condition asks for multiples, not multiples greater than 9. Hence A is correct.
Frequently asked questions
What is the correct answer to this question?
{9,18,27,36,45}
Why is this the correct answer?
Using natural numbers beginning at 1, the positive multiples of 9 below 50 are 9, 18, 27, 36, and 45. Zero is not included in this natural-number convention, and 54 is greater than 50. The number 9 itself must be included because the condition asks for multiples, not multiples greater than 9. Hence A is correct.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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