9231 P13 - Nov 2013 - Q1 - 6 marks
6441
Express \(\frac{1}{r(r+1)(r-1)}\) in partial fractions.
Find
\(\sum_{r=2}^{n} \frac{1}{r(r+1)(r-1)}\)
State the value of
\(\sum_{r=2}^{\infty} \frac{1}{r(r+1)(r-1)} .\)
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