Timeline for combinatoric proof $\sum_{i=0}^{n}(-1)^i\binom{n}{i}\binom{n-i+k-1}{k}=\binom{k-1}{k-n}$ [closed]
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Aug 13, 2021 at 16:19 | history | closed |
Nemo skupers user44191 Chris Ramsey Ben McKay |
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| Aug 12, 2021 at 7:58 | comment | added | Martin Sleziak | A question on Mathematics: Proving $\binom {n-1}{r-1}=\sum_{k=0}^r(-1)^k\binom r k \binom{n+r-k-1}{r-k-1}$. I found it using Approach0. Some advice on searching: How to search on this site? | |
| Aug 9, 2021 at 20:03 | answer | added | Fedor Petrov | timeline score: 5 | |
| Aug 9, 2021 at 19:48 | review | Close votes | |||
| Aug 13, 2021 at 16:19 | |||||
| Aug 9, 2021 at 19:25 | review | First posts | |||
| Aug 9, 2021 at 20:44 | |||||
| Aug 9, 2021 at 19:20 | history | asked | maya cohen | CC BY-SA 4.0 |