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MathNet 2016-part-07 — 182 problems (EN–VI) Question 123

Math Olympiad Vault · MathNet 2016-part-07 — 182 problems (EN–VI)

Question 123

Let $t=2016$ and $p=\ln 2$. Evaluate in closed form the sum
$$
\sum_{k=1}^{\infty}\left(1-\sum_{n=0}^{k-1} \frac{e^{-t} t^{n}}{n!}\right)(1-p)^{k-1} p
$$