Question

Fie A={0, 1, 2, 3} si multimea M a functiilor f : A -> A. Aflati probabilitatea ca, alegand o functie f din M, aceasta sa fie injectiva

Answer 1

$\it p= \dfrac{c_f}{c_p} = \dfrac{4!}{4^4} = \dfrac{1\cdot2\cdot3\cdot4}{4\cdot4\cdot4\cdot4}=\dfrac{3}{32}$