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# How many one one functions are defined from a set having n elements to a set having m elements?

Updated: 12/24/2022

Wiki User

12y ago

None if n > m

n! if n = m

and

mPn = m!/(m-n)! where k! denotes 1*2*...*k

Wiki User

12y ago

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Q: How many one one functions are defined from a set having n elements to a set having m elements?
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