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Find \[\sum_{n = 1}^\infty \frac{n^2 + n - 1}{(n + 2)!}.\]

 Dec 15, 2020
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∑[(n^2 + n - 1) / (n + 2)!, n, 1, ∞] = It converges to 1/2

 Dec 15, 2020

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