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What is the number line representation of the interval ([2,2])?

Answer and explanation

Correct answer: Only a closed point at (2)

The direct answer is option B: only a closed point at 2. The interval \([2,2]\) starts at 2 and ends at 2, and both square brackets say that the endpoint is included. There is no space between the endpoints because they are the same number. Therefore the set contains exactly one real number: 2. On the number line, represent it by one filled or closed dot at 2. Option A, no point, is wrong because 2 is included. Option B is correct because it shows exactly the single member of the interval. Option C, a ray to the right, represents something like \([2,\infty)\), containing numbers greater than 2, not just 2. Option D, a ray to the left, represents a set containing numbers less than 2, also not correct. The notation \([a,a]\) always reduces to the singleton set \(\{a\}\). Exam cue: equal closed endpoints mean one filled point; equal open endpoints would mean an empty set.

Related tags

Single Point IntervalNumber LineClosed Interval

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