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If (A={1,2,3}), (B={a,b}), and (f(1)=a), (f(2)=b), (f(3)=b), what type of function is (f:A\to B)?

Answer and explanation

Correct answer: Onto but not one-one

Step 1: Both elements (a) and (b) of the codomain appear as images. Step 2: Hence the function is onto. But (2) and (3) have the same image (b), so it is not one-one. Step 3: For finite sets, check whether every codomain element appears in the image list.

Related tags

Relations-FunctionsFinite-SetOnto-FunctionOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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