\[P = 1 - P_{3}(0) =\]
\[= 1 - C_{3}^{0} \bullet (0,7)^{0} \bullet (1 - 0,7)^{3 - 0} =\]
\[= 1 - 1 \bullet 1 \bullet {0,3}^{3} = 1 - 0,027 =\]
\[= 0,973.\]
\[Ответ:\ \ 0,973.\]