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How many one-to-one functions are there from a set $A$ with $n$ elements onto itself?
asked in Set Theory & Algebra by Veteran (29.1k points)   | 60 views

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There are n! one to one function possible with n elements to itself.. I.e. $P\binom{n}{n}$ = n!
answered by Veteran (44.8k points)  
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