\[\boxed{\mathbf{702\ (702).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[x_{n} = 6n - 50\]
\[6n - 50 < 0\]
\[6n < 50,\ \ n < \frac{50}{6},\]
\[\ \ n < 8\frac{1}{3},\ \ n = 8\]
\[Ответ:8\ членов.\]