\[\mathbf{Страница\ 30.}\]
\[\boxed{\mathbf{4.}}\]
\[Всего\ исходов\ 6.\]
\[Вероятность\ равна\ \frac{2}{6} = \frac{1}{3}.\]
\[Ответ:\ \frac{1}{3}.\]
\[\boxed{\mathbf{5.}}\]
\[Всего\ 5\ шаров.\]
\[\textbf{а)}\ \frac{2}{5} \cdot \frac{1}{4} = \frac{2}{20} = \frac{1}{10}\]
\[\textbf{б)}\ \frac{3}{5} \cdot \frac{2}{4} = \frac{6}{20} = \frac{3}{10}\]
\[\textbf{в)}\ \frac{2}{5} \cdot \frac{3}{4} + \frac{3}{5} \cdot \frac{2}{4} = \frac{3}{10} + \frac{3}{10} =\]
\[= \frac{6}{10} = \frac{3}{5}\text{.\ }\]
\[\boxed{\mathbf{6.}}\]
\[\textbf{а)}\ \frac{1}{6}\]
\[\textbf{б)}\ \frac{1}{6}\]
\[\textbf{в)}\ \frac{1}{6}\]
\[\textbf{г)}\ 7\]
\[\textbf{д)}\ \frac{6}{36} = \frac{1}{6}\]
\[\textbf{е)}\ \frac{1}{12}\]