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Which relation from A = {1,2,3} to B = {p,q} represents a function from A to B?

Answer and explanation

Correct answer: {(1,p),(2,q),(3,p)}

The correct answer is B. A function from A to B must assign every element of the domain A exactly one image in B. Check the first coordinates because they represent the domain elements. In option B, 1 is paired with p, 2 is paired with q, and 3 is paired with p. Every member of A appears once and has exactly one output, so B is a function. In option A, the element 1 has two outputs, p and q, which violates the definition. In option C, the element 3 has no output, so the assignment is incomplete. In option D, the element 2 has two outputs, p and q, so it is not a function. It is acceptable for two different domain elements to have the same image; therefore 1 and 3 may both map to p. Memory cue: every input gets one arrow, while several inputs may point to the same output.

Related tags

RelationsFunctionsDomain And CodomainClass 11 MathematicsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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