Does the series $\sum_{n=4}^\infty \frac{(-1)^n}{\log \log n}$ converge ?
I thought about alternating test, but for some reason this seems to easy. Why does it start with $n=4$? And how do I prove that $\frac1{\log \log n}$ is decreasing ?
Does the series $\sum_{n=4}^\infty \frac{(-1)^n}{\log \log n}$ converge ?
I thought about alternating test, but for some reason this seems to easy. Why does it start with $n=4$? And how do I prove that $\frac1{\log \log n}$ is decreasing ?
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