\[n_{1} = 1 + 3 + 4 = 8;\ \ \ \]
\[n_{2} = 3 + 2 + 3 = 8;\]
\[P(A) = \frac{1}{8} \bullet \frac{3}{8} + \frac{3}{8} \bullet \frac{2}{8} + \frac{4}{8} \bullet \frac{3}{8} =\]
\[= \frac{3 + 6 + 12}{64} = \frac{21}{64}.\]
\[Ответ:\ \ \frac{21}{64}.\]