Timeline for Proving Pascal's Rule : ${{n} \choose {r}}={{n-1} \choose {r-1}}+{{n-1} \choose r}$ when $1\leq r\leq n$
Current License: CC BY-SA 2.5
2 events
| when toggle format | what | by | license | comment | |
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| Feb 5, 2011 at 15:37 | history | edited | Derek Jennings | CC BY-SA 2.5 |
added 22 characters in body
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| Feb 5, 2011 at 15:29 | history | answered | Derek Jennings | CC BY-SA 2.5 |