\[\boxed{\mathbf{291.}}\]
\[Всего\ 6\ событий:\]
\[АБТ;БАТ;ТАБ;АТБ;БТА;ТБА.\]
\[\textbf{а)}\ К = 2:\]
\[Р = \frac{2}{6} = \frac{1}{3}.\]
\[\textbf{б)}\ М = 2:\]
\[Р = \frac{2}{6} = \frac{1}{3}.\]
\[\textbf{в)}\ L = 1:\]
\[Р = \frac{1}{6}.\]
\[\textbf{г)}\ У = 3:\]
\[Р = \frac{3}{6} = \frac{1}{2} = 0,5.\]