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Which set is an example of the empty set?

Answer and explanation

Correct answer: {x : x is a natural number and x < 1}

An empty set contains no element that satisfies its defining condition. Under the usual school convention that natural numbers start with 1, no natural number is less than 1. Thus option A represents the empty set. Option B contains 1, 2, 3, and 4; option C contains vowels; and option D contains even numbers such as 2, 4, 6, and 8, so those are not empty.

Related tags

SetsEmpty SetNatural NumbersClass 9 MathematicsGeneral Chapter PracticeCommon QuestionsCommonMathematics

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