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Which collection is most suitable to be called a set?

Answer and explanation

Correct answer: A list of 40 students in a class

The governing concept is that a set must be well-defined: membership should be decidable without personal opinion. A list of 40 students identifies a definite collection, so every member can be recognized objectively. The terms beautiful, good, and tall may be judged differently by different people unless a precise standard is supplied. Thus only the collection in option A is clearly a set.

Related tags

SetsWell-Defined SetSet MembershipClass 9 MathematicsGeneral Chapter PracticeCommon QuestionsCommonMathematics

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