\[y_{1} = 6;\ \ \ \ \ \ \ \ q = 4;\ \ \ \ \ \ S_{n} = 2046:\]
\[\frac{y_{1}\left( q^{n} - 1 \right)}{q - 1} = 2046\]
\[\frac{6 \cdot \left( 4^{n} - 1 \right)}{3} = 2046\]
\[4^{n} - 1 = \frac{2046}{2}\text{\ \ \ \ \ }\]
\[4^{n} - 1 = 1023\ \ \ \ \ \]
\[4^{n} = 1024\]
\[2^{2n} = 2^{10}\text{\ \ \ \ \ \ \ \ }\]
\[2n = 10\ \ \ \]
\[n = 5\]
\[Ответ:5.\ \ \]