\[\boxed{\mathbf{298.}}\]
\[\textbf{а)}\ 0;\]
\[\textbf{б)}\ N = 7:\]
\[P = \frac{1}{7}.\]
\[\textbf{в)}\ N(A) = 2;\]
\[P = \frac{2}{7}.\]
\[\textbf{г)}\ N(A) = 1;\]
\[\textbf{д)}\ N(A) = 4;\]
\[P = \frac{4}{7}.\]