Two Forbidden Values
Difficulty: Medium · Topics: Discrete Mathematics, Functions, Function Combinatorics
Ikkita taqiqlangan qiymat
How many one-to-one functions f:\1, 2, 3, 4\→\1, 2, 3, 4\ satisfy f(1)≠1 and f(4)≠4?
Nechta inyektiv f:\1, 2, 3, 4\→\1, 2, 3, 4\ funksiya f(1)≠1 va f(4)≠4 ni qanoatlantiradi?