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If E = {x : x is a natural number and x < 6}, which element is not in E?

Answer and explanation

Correct answer: 6

The governing idea is interpreting a set-builder condition with a strict inequality. Taking natural numbers as 1, 2, 3, and so on, the condition x < 6 produces E = {1, 2, 3, 4, 5}. Since the sign is strictly less than, 6 is excluded rather than included. Therefore 1, 3, and 5 belong to E, while option D, 6, does not.

Related tags

SetsSet-Builder NotationInequalitiesClass 9 MathematicsGeneral Chapter PracticeCommon QuestionsCommonMathematics

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