tranhtranh6889 tranhtranh6889

23-07-2021
Mathematics

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Có bao nhiêu hàm đơn ánh từ tập $\{a,b,c\}$ đến tập $\{1,2,3,4,5\}$?

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LammettHash LammettHash

23-07-2021

A function f : X → Y assigns only one value of y ∈ Y to any given x ∈ X.

For each of the three elements in {a, b, c}, there are 5 choices of values to assign from {1, 2, 3, 4, 5}, so there are 5³ = 125 possible functions.

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