How Many One-to-One Functions?
Difficulty: Easy · Topics: Discrete Mathematics, Functions, Function Combinatorics
Nechta inyektiv funksiya bor?
How many one-to-one functions f:\1, 2, 3\→\1, 2, …, 7\ are there?
Nechta inyektiv f:\1, 2, 3\→\1, 2, …, 7\ funksiya mavjud?