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If f:A→B, A={1,2,3,4}, B={0,1,2}, and f(x) gives the remainder when x is divided by 3, what is f(4)?

Answer and explanation

Correct answer: 1

The governing concept is evaluating a function from its defining rule. For every input x, f(x) is the remainder obtained when x is divided by 3. Using the division algorithm, 4 = 3×1 + 1, where the remainder is 1. Therefore f(4)=1, making option B correct. The codomain B={0,1,2} is also consistent with this result, because a remainder after division by 3 must be one of 0, 1, or 2. Option A would occur for a multiple of 3, such as 3; option C would occur for an input such as 2, whose remainder is 2; and option D cannot be a remainder on division by 3. Thus the function rule and the codomain both support option B.

Related tags

Relations FunctionsFunction EvaluationRemainderDivision AlgorithmFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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