\binom31 = 3,\quad \binom73 = \frac7 \cdot 6 \cdot 53 \cdot 2 \cdot 1 = 35,\quad \binom104 = \frac10 \cdot 9 \cdot 8 \cdot 74 \cdot 3 \cdot 2 \cdot 1 = 210 - Nelissen Grade advocaten