Solving Master
Resources for HKDSE Mathematics
$\begi
下表為樣本空間。
$\begin{array}{|c|c|c|c|c|c|} \hline
所求的數目
$\begin{array}{cl} = & C^{15}_1 \times C^
所求的概率
$\begin{array}{cl} = & C^4_2 (0.6)^2(1-0