Ans: B
The required probability
The required probability
$\begin{array}{cl}
= & \dfrac{6}{20} \\
= & 0.3
\end{array}$
Resources for HKDSE Mathematics
Resources for HKDSE Mathematics
$\begin{array}{cl}
= & \dfrac{6}{20} \\
= & 0.3
\end{array}$
