\[\left( \frac{a^{3}b^{2}}{2c} \right)^{2} \cdot \frac{(2c)^{3} \cdot a^{6}}{b^{5}} =\]
\[= \frac{a^{6}b^{4} \cdot 8c^{3} \cdot a^{6}}{4c^{2} \cdot b^{5}} = \frac{2a^{12}c}{b}.\]