Timeline for Proving $\sum_{k=m}^n \binom{k}{m} {n\brack k} = \sum_{k=m}^n \frac{n!}{k!} {k\brack m} $
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| Feb 11, 2021 at 10:32 | history | edited | metamorphy | CC BY-SA 4.0 |
simplified notation
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| Jun 9, 2020 at 16:23 | comment | added | Mike Earnest | @DavidHolden FYI, you can change which answer you have accepted, and doing so is encouraged. | |
| Feb 13, 2017 at 0:59 | comment | added | David Holden | thanks, very nice. i couldn't see how to make use of the extra element. sorry can't accept your answer as i've already accepted Marko's treatment of the other problem, but +1 anyway! | |
| Feb 12, 2017 at 20:59 | history | answered | Jeremy Dover | CC BY-SA 3.0 |