\[\boxed{\text{518\ (518).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ если\ n = 6:\]
\[( - 1)^{n} = ( - 1)^{6} = 1.\]
\[\textbf{б)}\ \ если\ n = 11:\ \]
\[( - 1)^{n} = ( - 1)^{11} = - 1.\]
\[\textbf{в)}\ \ если\ n = 23:\]
\[\ ( - 1)^{n} = ( - 1)^{23} = - 1.\]
\[\textbf{г)}\ \ \ если\ n = 70:\ \ \ \]
\[( - 1)^{n} = ( - 1)^{70} = 1.\]