b********t 发帖数: 5 | 1 【 以下文字转载自 Mathematics 讨论区 】
发信人: bigfatpant (bigfatpant), 信区: Mathematics
标 题: 请教一道数列求和题
关键字: 数列求和
发信站: BBS 未名空间站 (Wed Jun 1 07:11:39 2016, 美东)
初到贵地, 请教大神们一道数列求和问题:
Please find the exact closed form expression of
∑_(n=1)^∞ (λ^n∙e^(-λ))/(n^2∙n!).
It would be greatly appreciated if a brief derivation could be provided.
非常感谢。 |
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