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
1 event
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 4, 2011 at 23:25 | history | answered | anonymous | CC BY-SA 2.5 |