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The function (f:{1,2,3,4}\to\mathbb{N}) is defined by (f(x)=\frac{12}{x}). Which statement is correct?

Answer and explanation

Correct answer: It is a function and range is ({3,4,6,12})

The direct answer is B. A function must give one natural-number output for every input 1, 2, 3, and 4. Compute the values: f(1)=12, f(2)=6, f(3)=4, and f(4)=3. All four values are natural numbers, so the rule is a valid function into N. The range is the set of values actually obtained, namely {12,6,4,3}, which is the same set as {3,4,6,12}; therefore option B is correct. Option A is wrong because f(4)=12/4=3, and 3 is a natural number. Option C is wrong because {1,2,3,4} is the domain, not the range; the outputs are different numbers. Option D is wrong because f(1)=12 is defined, not undefined. The key distinction is domain versus range: domain lists allowed inputs, while range lists outputs produced by those inputs.

Related tags

CodomainRangeNatural NumbersHard

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