\[\boxed{\mathbf{286.}}\]
\[\textbf{а)}\ Делители\ числа\ 12:\]
\[\left\{ 1;2;3;4;6 \right\}.\]
\[N = 6;\]
\[N(A) = 5;\]
\[P = \frac{5}{6}.\]
\[\textbf{б)}\ Кратно\ 5:\left\{ 5 \right\}.\]
\[N = 6;\]
\[N(A) = 1;\]
\[P = \frac{1}{6}.\]
\[\textbf{в)}\ Больше\ двух\ очков:\]
\[\left\{ 3;4;5;6 \right\}.\]
\[N = 6;\]
\[N(A) = 4;\]
\[P = \frac{4}{6} = \frac{2}{3}.\]
\[\textbf{г)}\ Больше\ одного,\ \]
\[но\ меньше\ 6\ очков:\]
\[\left\{ 2;3;4;5 \right\}.\]
\[N = 6;\]
\[N(A) = 4;\]
\[P = \frac{4}{6} = \frac{2}{3}.\]