Exactly Two Fixed Points
Difficulty: Medium · Topics: Discrete Mathematics, Functions, Function Combinatorics
Aynan ikkita qo‘zg‘almas nuqta
Let X=\1, 2, 3, 4, 5\. How many one-to-one functions f:X→ X have exactly two fixed points (f(x)=x)?
X=\1, 2, 3, 4, 5\ bo‘lsin. Nechta inyektiv f:X→ X funksiya aynan ikkita qo‘zg‘almas nuqtaga (f(x)=x) ega?