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If a number line has an open endpoint at a and a closed endpoint at b, where a < b, which interval is correct?

Answer and explanation

Correct answer: (a,b]

Interval notation records whether each endpoint belongs to the represented set. A round parenthesis means the endpoint is open and excluded, whereas a square bracket means the endpoint is closed and included. Since a is marked open, the interval contains numbers greater than a but not a itself. Since b is marked closed, b is included, so the upper condition is less than or equal to b. Combining these conditions gives a < x ≤ b, written as (a,b]. Hence option B is correct. Option A includes both endpoints and is wrong at a; option C includes a but excludes b; option D excludes both endpoints. The order a < b ensures this is a valid nonempty interval.

Related tags

Linear-InequalitiesInterval-NotationOpen-Closed-EndpointsNumber-LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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