Which option correctly describes U={6,12,18,24,30}?
Answer and explanation
Correct answer: Positive multiples of 6 up to 30
The governing idea is to test both the rule and the endpoint. Each listed number can be written as 6 times a positive integer: 6, 12, 18, 24, and 30, and 30 is included. Therefore the set contains the positive multiples of 6 up to 30, so option A is correct. Option B wrongly excludes 30, option C stops too early, and option D describes factors of 30, not multiples of 6.
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What is the correct answer to this question?
Positive multiples of 6 up to 30
Why is this the correct answer?
The governing idea is to test both the rule and the endpoint. Each listed number can be written as 6 times a positive integer: 6, 12, 18, 24, and 30, and 30 is included. Therefore the set contains the positive multiples of 6 up to 30, so option A is correct. Option B wrongly excludes 30, option C stops too early, and option D describes factors of 30, not multiples of 6.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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