Which option gives the correct roster form of R={x∈W: x<3 or x=5}?
Answer and explanation
Correct answer: R={0,1,2,5}
The governing idea is roster form: list every element satisfying the stated condition exactly once. Whole numbers are W={0,1,2,3,...}. The values less than 3 are 0, 1, and 2. The word “or” adds 5 as another member, so R={0,1,2,5}. Option A omits 0, option C incorrectly includes 3, and option D omits the values below 3.
Frequently asked questions
What is the correct answer to this question?
R={0,1,2,5}
Why is this the correct answer?
The governing idea is roster form: list every element satisfying the stated condition exactly once. Whole numbers are W={0,1,2,3,...}. The values less than 3 are 0, 1, and 2. The word “or” adds 5 as another member, so R={0,1,2,5}. Option A omits 0, option C incorrectly includes 3, and option D omits the values below 3.
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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