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In which relation does 2 have no image, so it is not a function from A={1,2,3}?

Answer and explanation

Correct answer: {(1,a),(3,b)}

The governing concept is the domain requirement for a function. A function from A={1,2,3} to another set must assign exactly one image to every element of A. In option A, the first components are 1 and 3 only; the element 2 does not appear at all. Consequently, 2 has no image, so this relation is not a function whose domain is the whole set A. Option A is correct. In option B, each of 1, 2, and 3 appears once and receives an image. The same complete coverage occurs in options C and D. A repeated output is allowed in a function, so the fact that several elements could map to the same value would not by itself cause failure. The decisive problem in A is the missing domain element 2.

Related tags

FunctionsDomainImageNot-FunctionMathematicsClass 11Functions As A Special Kind Of RelationRelations And Functions

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