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If a shaded region is described as ( (3,3) ) on a number line, what is its solution?

Answer and explanation

Correct answer: ( \emptyset )

The direct answer is option C, the empty set ∅. On a number line, the notation (3,3) means the strict interval 3<x<3. No real number can be greater than 3 and less than 3 at the same time. Therefore there are no points to shade and the solution set is empty. Option A, {3}, would be correct for the single equation x=3 or a closed singleton, not for an open interval (3,3). Option B, ℝ, would mean every real number is included, which is clearly not the case. Option C correctly represents no possible value. Option D, (-∞,3), includes all numbers less than 3 and is much larger than the stated interval. A useful distinction is that [3,3] would contain the single number 3, while (3,3) contains nothing. Memory cue: identical open endpoints make an empty interval; identical closed endpoints make a one-point set.

Related tags

Linear-InequalitiesEmpty-IntervalNumber-Line

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