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Let (A={1,2,3}) and (B={4,5,6}). How many functions (f:A\to B) are both one-one and onto?

Answer and explanation

Correct answer: (6)

Step 1: Both sets have (3) elements. Step 2: A function that is one-one and onto must pair every element uniquely, so the number is (3!). Step 3: In exams, for two finite sets of the same size, bijections are counted as (n!).

Related tags

FunctionsOne-OneOntoBijectionRelations And FunctionsMathematicsClass 12 Mcq

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