prove that the series 1+1/4+1/7+1/10... diverges.
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Originally Posted by alexandrabel90 prove that the series 1+1/4+1/7+1/10... diverges. Have you written the the formula that produces this series? $\displaystyle \frac{1}{1}+\frac{1}{4}+\frac{1}{7}+...=\sum_{n=1} ^{\infty}\frac{1}{3n-2}$
Last edited by mr fantastic; May 4th 2010 at 05:08 PM. Reason: Merged posts.
Originally Posted by dwsmith Have you written the the formula that produces this series? $\displaystyle \frac{1}{1}+\frac{1}{4}+\frac{1}{7}+...=\sum_{n=1} ^{\infty}\frac{1}{3n-2}$ I'll just add that it should now be clear that an appropriate test can be used.
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