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Apr 23, 2017 at 12:51 history edited T. Amdeberhan CC BY-SA 3.0
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Apr 12, 2017 at 19:57 history edited T. Amdeberhan CC BY-SA 3.0
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Apr 12, 2017 at 5:42 review Low quality posts
Apr 12, 2017 at 6:54
Apr 12, 2017 at 5:40 comment added thiswontwork I'm afraid my formula was badly written, I intended $2(n!)$ rather than $(2n)!$. In any case, how did you derive the above equality?
Apr 12, 2017 at 5:22 history answered T. Amdeberhan CC BY-SA 3.0