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What is the interval notation for 1 ≤ x ≤ 4?

Answer and explanation

Correct answer: [1, 4]

The inequality 1 ≤ x ≤ 4 includes every real number from 1 through 4. Because equality is allowed at both ends, the numbers 1 and 4 are included in the solution set. Therefore, square brackets are used at both endpoints, giving the closed interval [1, 4]. Parentheses would incorrectly exclude an endpoint.

Related tags

SetsInterval NotationClosed IntervalInequalitiesReal NumbersRepresentation On Number LineLinear InequalitiesMathematics

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