De kans is $\frac{9}{16}\cdot \frac{9}{16}=\frac{81}{256}$.

De kans is $\frac{7}{16}\cdot \frac{6}{16}=\frac{42}{256}=\frac{21}{128}$.

$\text{P}(\text{aantal}=10)=1-\frac{81}{256}-\frac{21}{128}=\frac{133}{256}$