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• (가)$\displaystyle 1+ \frac{2} {3} + \frac{3} {5} + \frac{4} {7} + \cdots$
• (나)$\displaystyle 1+ \frac{1} {5} + \frac{1} {9} + \frac{1} {13} + \cdots$
• (다)$\displaystyle \frac{1} {e} - \frac{2} {e^2} + \frac{3} {e^3} - \frac{4} {e^4} + \cdots$
• (라)$3+ \left (-3 \right) +3+ \cdots + \left (-1 \right) ^ {(n-1)} \cdot 3+ \cdots$