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What is the solution of (7, 7) on the number line?

Answer and explanation

Correct answer: ∅

In interval notation, (7, 7) denotes all real numbers x satisfying 7 < x < 7. The governing idea is that an open interval contains numbers strictly between its endpoints, but there is no real number strictly greater than 7 and strictly less than 7 at the same time. The endpoint 7 is also excluded because the parentheses are open. Consequently, the interval has no point and its solution set is the empty set, written as ∅. Option C is therefore correct. Option A, {7}, would include the single value 7, but that value is not allowed in an open interval. Options B and D are one-sided intervals and contain many values that fail one of the two required inequalities.

Related tags

Linear-InequalitiesEmpty-IntervalNumber-LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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