Question:
Consider the infinite arithmetic sequence $A$ with first term $5$ and common difference $-2$. Now define the infinite sequence $B$ so that the $k^{th}$ term of $B$ is $2$ raised to the $k^{th}$ term of $A$. Find the sum of all of the terms of $B$.

Answer:
$B$ is an infinite geometric sequence with first term $2^5$ and common ratio $2^{-2}=\frac{1}{4}$. Thus the sum of all of the terms of $B$ is: $\frac{32}{1-\frac{1}{4}}=\boxed{\frac{128}{3}}$.