\[6;4,8;3,6;\ldots\]
\[a_{1} = 6;\ \ a_{2} = 4,8;\ \]
\[d = 4,8 - 6 = - 1,2;\]
\[a_{n} = a_{1} + d(n - 1)\]
\[6 - 1,2(n - 1) > 0\]
\[6 - 1,2n + 1,2 > 0\]
\[1,2n < 7,2\]
\[n < 6.\]
\[Ответ:5\ положительных\ членов.\]