Question Number 146425 by mathdanisur last updated on 13/Jul/21
$$\mathrm{4}\:{people}\:{took}\:{the}\:{elevator}\:{to}\:{the}\:{first} \\ $$$${floor}\:{of}\:{the}\:\mathrm{6}\:-\:{storey}\:{building}.\:{Find} \\ $$$${the}\:{probability}\:{that}\:{they}\:{fall}\:{on} \\ $$$${different}\:{floors}. \\ $$
Commented by ajfour last updated on 13/Jul/21
$${elavator}-{which}\:{company}? \\ $$
Commented by mathdanisur last updated on 13/Jul/21
$${Elavator}-{Carrying}\:{people}\:{to}\:{high}-{rise} \\ $$$${buildings} \\ $$
Answered by ajfour last updated on 13/Jul/21
$$\frac{\:^{\mathrm{6}} {C}_{\mathrm{4}} ×\mathrm{4}!}{\mathrm{6}^{\mathrm{4}} } \\ $$
Commented by mr W last updated on 13/Jul/21
$$\mathrm{6}\:{or}\:{only}\:\mathrm{5}\:{destinations}? \\ $$