Leonard Euler Found the Following Series to Be Noteworthy Because $\pi$

Essay

Leonard Euler found the following series to be noteworthy because it is part of a process that can be used to approximate $\pi$ : $1-\frac{1}{3 \cdot 64}+\frac{1}{5 \cdot 64^{2}}-\frac{1}{7 \cdot 64^{3}}+\frac{1}{9 \cdot 64^{4}}-\ldots$
(a)Re-write this series in summation notation.
(b)Use an appropriate test to show that the series converges.