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[How will ( (2,8]\setminus{5} ) be shown on a number line?)

Answer and explanation

Correct answer: An open endpoint at 2, a closed endpoint at 8, and an open hole at 5

In the interval \((2,8]\), 2 is excluded, so it has an open endpoint, while 8 is included, so it has a closed endpoint. The notation \(\setminus\{5\}\) removes 5 from the interval, so an open hole must be marked at 5. Therefore, option A is correct. Exam tip: round brackets indicate open endpoints, whereas square brackets indicate closed endpoints.

Related tags

Linear InequalitiesSet DifferenceNumber Line RepresentationInterval NotationOpen And Closed EndpointsRepresentation On Number LineMathematicsClass 11 Mcq

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