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If (A) is a finite set and (f:A\to A) is onto, which conclusion is true?

Answer and explanation

Correct answer: (f) is also one-one

Step 1: Onto means every codomain element is used. Step 2: For finite equal sets, if two domain elements had the same image, some codomain element would be left unused. Step 3: Therefore an onto function from (A) to (A) is also one-one.

Related tags

FunctionsFinite-SetOntoOne-OneRelations And FunctionsMathematicsClass 12 Mcq

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