\[\boxed{\mathbf{296.}}\]
\[Всего\ событий:N = 100.\]
\[\textbf{а)}\ \frac{1}{100} + \frac{1}{100} + \frac{1}{100} + \frac{1}{100} =\]
\[= \frac{4}{100} = 0,04.\]
\[\textbf{б)}\ \frac{3}{100} + \frac{3}{100} = \frac{6}{100} = 0,06.\]
\[\textbf{г)}\ P(A) = 0,2;\ \ \]
\[P(A) + P(B) = 1\]
\[0,2 + P(B) = 1\]
\[P(B) = 1 - 0,2\]
\[P(B) = 0,8.\]