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In which option is the relation not a function from A = {1,2,3,4,5} to B = {p,q,r}, even though every element of A appears as a first component?

Answer and explanation

Correct answer: {(1,p),(2,q),(3,q),(4,r),(5,p),(4,q)}

A relation from A to B is a function when every element of A occurs as a first component exactly once, with one and only one corresponding element of B. Options A, B and D each contain five ordered pairs, and the first components 1, 2, 3, 4 and 5 occur once each. They therefore satisfy the function condition, even if several different inputs have the same output. In option C, the first component 4 occurs twice: (4,r) and (4,q). Hence 4 has two images, r and q, so the uniqueness requirement fails. The repeated output for different inputs in the other options is allowed; a function need not be one-one. It is also enough that each input has one image; not every element of B must be used. Therefore option C is the only correct choice.

Related tags

Relations-And-FunctionsFunction-TestOrdered-PairsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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