## Thinking Mathematically (6th Edition)

The fraction is $\frac{3}{4}$.
Number of bits and pieces of Dr. Frankenstein’screature that must still be obtained is: \begin{align} & {{2}^{-1}}+{{2}^{-2}}=\frac{1}{2}+\frac{1}{{{2}^{2}}} \\ & =\frac{1}{2}+\frac{1}{4} \\ & =\frac{3}{4} \end{align}