\[- 32; - 16; - 8;\ \]
\[b_{1} = - 32;\ \ b_{2} = - 16;\ \]
\[q = \frac{b_{2}}{b_{1}} = \frac{- 16}{- 32} = \frac{1}{2};\ \]
\[b_{12} = b_{1} \cdot q^{11} = - 32 \cdot \left( \frac{1}{2} \right)^{11} =\]
\[= ( - 2)^{5} \cdot \frac{1}{2^{11}} = - 2^{- 6} = - \frac{1}{64}.\]