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How many one-one functions can be formed from (A={1,2,3,4}) to (A)?

Answer and explanation

Correct answer: \(24\) / (24)

Step 1: For finite sets of equal size, a one-one function acts like a permutation. Step 2: The (4) elements can be mapped distinctly in (4!=24) ways. Step 3: When domain and codomain have equal size (n), the number of one-one functions is (n!).

Related tags

BijectionInjectionCountingFinite SetOne One FunctionRelations And FunctionsMathematicsClass 12 Mcq

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