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How will ( [2,5]\setminus{3} ) be shown on a number line?

Answer and explanation

Correct answer: Closed endpoints at ( 2 ) and ( 5 ); an open hole at ( 3 ); the remaining part from 2 to 5 is shaded

The interval [2,5] includes both 2 and 5, so the number line has closed endpoints at these values. Since 3 is removed from the interval, it must be marked with an open hole. Equivalently, the set is [2,3) ∪ (3,5]. Exam tip: a square bracket indicates inclusion, while a parenthesis or open hole indicates exclusion.

Related tags

Linear-InequalitiesSet-DifferenceNumber-LineInterval-NotationRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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