Never Below the Input
Difficulty: Easy · Topics: Discrete Mathematics, Functions, Function Combinatorics
Hech qachon kirish qiymatidan kichik emas
Let X=\1, 2, 3, 4, 5\. How many functions f:X→ X satisfy f(x)≥ x for every x?
X=\1, 2, 3, 4, 5\ bo‘lsin. Nechta f:X→ X funksiya har bir x uchun f(x)≥ x ni qanoatlantiradi?