Which is the roster form of M={x:x is a positive multiple of 5 less than 30}?
Answer and explanation
Correct answer: M={5,10,15,20,25}
The positive multiples of 5 are 5, 10, 15, 20, 25, 30, and so on. The word “positive” excludes 0, while “less than 30” excludes 30 itself. Thus the required elements are exactly 5, 10, 15, 20, and 25. Option A incorrectly includes zero, option C includes 30, and option D leaves out 5. Therefore B is correct.
Frequently asked questions
What is the correct answer to this question?
M={5,10,15,20,25}
Why is this the correct answer?
The positive multiples of 5 are 5, 10, 15, 20, 25, 30, and so on. The word “positive” excludes 0, while “less than 30” excludes 30 itself. Thus the required elements are exactly 5, 10, 15, 20, and 25. Option A incorrectly includes zero, option C includes 30, and option D leaves out 5. Therefore B is correct.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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