\[\frac{12^{n + 1} \cdot 5^{n}}{6^{n} \cdot 10^{n}} = \frac{12^{n} \cdot 12 \cdot 5^{n}}{60^{n}} =\]
\[= \frac{60^{n} \cdot 12}{60^{n}} = 12\]
\[Ответ:12.\ \ \]