For any non-negative integers $n$ and $r$, where $0 \le r < n$,
- $C^n_r=C^n_{n-r}$,
- $C^n_r+C^n_{r+1}=C^{n+1}_{r+1}$.
Resources for HKDSE Mathematics
Resources for HKDSE Mathematics
For any non-negative integers $n$ and $r$, where $0 \le r < n$,
