Which option is a well-defined set?
Answer and explanation
Correct answer: Collection of even natural numbers less than 20
A well-defined set has an objective rule that lets us decide unambiguously whether an object belongs to it. “Even natural numbers less than 20” gives such a rule. Good, beautiful, and difficult depend on personal judgement or context, so different people may include different objects in those collections.
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What is the correct answer to this question?
Collection of even natural numbers less than 20
Why is this the correct answer?
A well-defined set has an objective rule that lets us decide unambiguously whether an object belongs to it. “Even natural numbers less than 20” gives such a rule. Good, beautiful, and difficult depend on personal judgement or context, so different people may include different objects in those collections.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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