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JH

# Use the partial fraction command on your CAS to find a convenient expression for the partial sum, and then use this expression to find the sum of the series. Check your answer by using CAS to sum the series directly.$\displaystyle \sum_{n = 3}^{\infty} \frac {1}{n^5 - 5n^3 + 4n}$

## $\sum_{n=3}^{\infty} \frac{1}{n^{5}-5 n^{3}+4 n}=\frac{1}{96}$

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