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If f = {(0,2), (1,3), (2,4)}, what is the value of f(2)?

Answer and explanation

Correct answer: 4

The governing concept is evaluation of a function represented by ordered pairs. In an ordered pair (input, output), the first component is the input and the second component is its image. To calculate f(2), locate the pair whose first component is 2. The given set contains (2,4), so the image of 2 is 4 and f(2)=4. Thus option A is correct. Option B is the input itself rather than its function value. Option C is the image of 1 because the pair (1,3) is present. Option D is another input, namely the first component of (0,2). Since the pair for input 2 is explicitly given and each input has one image, the answer is unambiguous.

Related tags

FunctionsFunction-ValueOrdered-PairsMathematicsClass 11Functions As A Special Kind Of RelationRelations And FunctionsClass 11 Mcq

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