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