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Omni-MATH / A function f:1,2,3,4,5→1,2,3,4,5 is said to be nasty if there do not exist distinct a,b∈1,2,3,4,5 satisfying f(a)=b and f(b)=a. How many nasty functions are there? · Discussion

Discussing A function f:{1,2,3,4,5}→{1,2,3,4,5} is said to be nasty if there do not exist distinct a,b∈{1,2,3,4,5} satisfying f(a)=b and f(b)=a. How many nasty functions are there? · Omni-MATH

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