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limn→∞∑r=0n(13r+1−13r+2)= ?\lim_{n \rightarrow \infty} \sum _{r=0}^{n}{\left(\frac {1}{3r+1}-\frac{1}{3r+2} \right) } = \ ? n→∞limr=0∑n(3r+11−3r+21)= ?
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