2021-II-42
Ans: D
… Read The required number of different choirs
$\begin{arr
HKDSE-MATH - 2021
2021-II-43
Ans: D
… Read The required probability
$\begin{array}{cl}
=
2021-II-44
Ans: C
… Read Let $\sigma$ be the standard deviation of the examina
2021-II-45
Ans: B
… Read Let $a$ and $d$ be the first term and the common differe