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If (f:\mathbb{Z}\to2\mathbb{Z}), (f(n)=2n), where (2\mathbb{Z}) is the set of even integers, choose the correct option.

Answer and explanation

Correct answer: Onto and one-one

Step 1: The codomain contains only even integers. Step 2: Any even integer (y) can be written as (y=2k), where (k\in\mathbb{Z}). Then (f(k)=y), so the function is onto. Different (n) values give different (2n). Step 3: Changing the codomain can make the same rule onto.

Related tags

Relations-FunctionsInteger-CodomainOnto-FunctionOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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