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What is the range of the graph of (f(x)=x-\lfloor x \rfloor)?

Answer and explanation

Correct answer: ([0,1))

The direct answer is option A, \([0,1)\). The expression \(x-\lfloor x\rfloor\) is the fractional part of x. For every real x, the floor \(\lfloor x\rfloor\) is the greatest integer not exceeding x, so \(0\le x-\lfloor x\rfloor<1\). The value 0 occurs whenever x is an integer, for example x=2. The value 1 never occurs: just before the next integer, the fractional part gets close to 1 but remains less than 1. Option A is therefore correct. Option B, \((0,1]\), wrongly excludes 0 and includes the impossible value 1. Option C, \([0,1]\), wrongly includes 1. Option D, \(\mathbb R\), is wrong because the output is always between 0 and 1. Negative numbers cause no exception; for example, \(-1.3-\lfloor-1.3\rfloor=-1.3-(-2)=0.7\). Memory cue: fractional part includes 0 but never includes 1.

Related tags

GraphsFractional-PartRange

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