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I am trying to find the limit of the sequence $a_n$ defined by the initial term $a_1=3$ and the recurrence relation: $$a_n = a_{n-1} - \frac{1}{(n-1) \cdot n \cdot n!}, \quad \text{for } n = 2, 3, \ldots.$$I need to determine: $$\lim_{n \to \infty} a_n$$ I started writing out terms and got $$a_n = 3-\sum_{k=2}^{n} \frac{1}{(k-1) \cdot k \cdot k!} $$ which is almost telescopic but that $k!$ is in the way. I don't know how to proceed from here so aby help would be appreciated.

Anne Bauval
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skymlgg
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  • Do you have a guess of what the infinite sum works out to? Like is it similar to another series that you know of? Have you tried entering it into wolfram to see if it converges to a nice value? – Calvin Lin Feb 13 '25 at 19:40

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