Ans: C
The required number
The required number
$\begin{array}{cl}
= & P^6_6 \times P^7_2 \\
= & 30\ 240
\end{array}$
Resources for HKDSE Mathematics
Resources for HKDSE Mathematics
$\begin{array}{cl}
= & P^6_6 \times P^7_2 \\
= & 30\ 240
\end{array}$
