Ans: B
The required probability
The required probability
$\begin{array}{cl}
= & \dfrac{9!}{10!} \\
= & \dfrac{1}{10}
\end{array}$
Resources for HKDSE Mathematics
Resources for HKDSE Mathematics
$\begin{array}{cl}
= & \dfrac{9!}{10!} \\
= & \dfrac{1}{10}
\end{array}$
