How many one-to-one functions are there from a set with


Question: a. How many one-to-one functions are there from a set with three elements to a set with four elements?

b. How many one-to-one functions are there from a set with three elements to a set with two elements?

c. How many one-to-one functions are there from a set with three elements to a set with three elements?

d. How many one-to-one functions are there from a set with three elements to a set with five elements?

e. How many one-to-one functions are there from a set with m elements to a set with n elements, where m ≤ n?

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Mathematics: How many one-to-one functions are there from a set with
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