\[a_{1} = 3,2;\ \ q = \frac{1}{2}\]
\[a_{7} = a_{1} \cdot q^{6} = 3,2 \cdot \left( \frac{1}{2} \right)^{6} =\]
\[= 3,2 \cdot \frac{1}{64} = \frac{32}{640} = \frac{1}{20} = 0,05.\]