\[\boxed{\mathbf{249.}}\]
\[\textbf{а)}\ 0,4 + 0,2 + P(c) = 1\]
\[P(c) = 1 - 0,6\]
\[P(c) = 0,4.\]
\[\textbf{б)}\ \frac{1^{\backslash 3}}{2} + \frac{1^{\backslash 2}}{3} + P(c) = 1\]
\[P(c) = 1 - \frac{3}{6} - \frac{2}{6}\]
\[P(c) = \frac{1}{6}.\]
\[\textbf{в)}\ 0,1 + 0,01 + P(c) = 1\]
\[P(c) = 1 - 0,11\]
\[P(c) = 0,89.\]
\[\textbf{г)}\ p + 0,8 - p + P(c) = 1\]
\[P(c) = 1 - 0,8\]
\[P(c) = 0,2.\]