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Find the number of one-one function f(A) - A satisfying f(f(i)) =i. Given that A has four elements (1,2,3,4 ) .......... Sir plz explain briefly from basics

Find the number of one-one function f(A) - A satisfying f(f(i)) =i. Given that A has four elements (1,2,3,4 ) .......... Sir plz explain briefly from basics
 

Grade:12th pass

1 Answers

Anish Singhal
askIITians Faculty 1194 Points
2 years ago
Number of one one function formula is n^m*m!, where f is a function from set A to B and n(A)=m and n(B)=n.

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