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Mar 2, 2022 at 12:36 comment added Max Alekseyev By symmetry of binomial coefficients and change of summation index $k\to k-n$.
Mar 2, 2022 at 5:27 comment added Matt Majic Thank you. How do you go from the second step to the third, where the range goes from $0$ to $2n$?
Mar 2, 2022 at 5:20 vote accept Matt Majic
Mar 2, 2022 at 5:27
Feb 28, 2022 at 14:52 history edited Max Alekseyev CC BY-SA 4.0
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Feb 28, 2022 at 14:44 history edited Max Alekseyev CC BY-SA 4.0
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Feb 28, 2022 at 14:38 history answered Max Alekseyev CC BY-SA 4.0