Infinite Seriesmedium
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For the convergent series n=11n3\sum_{n=1}^{\infty} \frac{1}{n^3} with exact sum S=π26S = \frac{\pi^2}{6}, estimate the tail error R5=n=61n3R_5 = \sum_{n=6}^{\infty} \frac{1}{n^3} using the integral remainder bound.