Question Number 108399 by bobhans last updated on 16/Aug/20
Commented by mr W last updated on 16/Aug/20
$$\mathrm{1}−\frac{\mathrm{9}!}{\mathrm{10}!/\mathrm{2}!}=\frac{\mathrm{4}}{\mathrm{5}} \\ $$
Commented by bobhans last updated on 17/Aug/20
$${yess}…. \\ $$