| Soient {p,q\in\mathbb{N}}. Montrer que : {\displaystyle\sum_{k=p}^{q}\displaystyle\binom{k}{p}=\displaystyle\binom{q+1}{p+1}}. |
| Soient {p,q\in\mathbb{N}}. Montrer que : {\displaystyle\sum_{k=p}^{q}\displaystyle\binom{k}{p}=\displaystyle\binom{q+1}{p+1}}. |