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If f(x) = ⌈3x⌉ and x ∈ (0, 1], what is the range of f?

Answer and explanation

Correct answer: {1, 2, 3}

The relevant idea is the range of the ceiling function on a restricted interval. Since 0<x≤1, multiplying by 3 gives 0<3x≤3. When 0<3x≤1, ⌈3x⌉=1; when 1<3x≤2, the ceiling is 2; and when 2<3x≤3, it is 3. All three outputs actually occur: for example, x=1/3 gives 1, x=1/2 gives 2, and x=1 gives 3. The value 0 never occurs because 3x is always positive, even when x approaches zero from the right. The output is always an integer, so the range is the set {1,2,3}, not a continuous interval. Therefore option A is correct. Option B incorrectly includes 0, option C omits 3, and option D describes an interval rather than the discrete output set.

Related tags

Real-Valued FunctionsRangeCeiling FunctionDomainRelations And FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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