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If x ∈ ℤ and 2 ≤ x < 7, how many integer values of x are there?

Answer and explanation

Correct answer: 5

The governing concept is counting integers in a compound inequality while treating closed and open endpoints correctly. The condition 2 ≤ x includes 2, whereas x < 7 excludes 7. Since x is restricted to the integers, list the values from the included lower endpoint up to, but not including, the upper endpoint: 2, 3, 4, 5, and 6. There are five values. Equivalently, the count is 7 − 2 = 5 because the lower endpoint is included and the upper endpoint is excluded. Option B is correct. Four would omit one valid integer, six would incorrectly include 7, and seven confuses the interval length with the number of integer points.

Related tags

Linear-InequalitiesInteger-ValuesCompound-InequalityCountingAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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