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Consider R={(x,y)∈N×N:y=x+2} from N to N. Which statement is correct?

Answer and explanation

Correct answer: It is a function

A function from a domain to a codomain must assign exactly one codomain value to every domain element. Here the relation is defined by y=x+2. If any natural number x is selected, the rule produces the single value x+2; this value is also natural, so it belongs to the stated codomain N. For example, 1 maps to 3, 2 maps to 4, and so on. The fact that y is larger than x does not violate the definition, and an infinite domain is completely acceptable. There are no two different outputs for the same x. Hence option A is correct; the other options confuse size or finiteness with the one-output requirement.

Related tags

Relations-FunctionsFunction-DefinitionNatural-NumbersFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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