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Suppose $a_n>0$ for each $n\in \mathbb{N}$ and $\sum_{n=0}^{\infty} a_n $ diverges. How would one go about showing that $\sum_{n=0}^{\infty} \frac{a_n}{a_n+3}$ diverges?

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    A similar question is [here](http://math.stackexchange.com/questions/131678/positive-series-problem/131712).2012-12-21

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