If \( \sum_{r=1}^{n} T_{r}=\frac{n}{8}(n+1)(n+2)(n+3) \), find \( \...
If \( \sum_{r=1}^{n} T_{r}=\frac{n}{8}(n+1)(n+2)(n+3) \), find \( \sum_{r=1}^{n} \frac{1}{T_{r}} \)
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