Ans: B
Note that the prime numbers between $40$ and $49$ are $41$, $43$ and $47$. Hence, the required probability
Note that the prime numbers between $40$ and $49$ are $41$, $43$ and $47$. Hence, the required probability
$\begin{array}{cl}
= & \dfrac{3}{10} \\
= & 0.3
\end{array}$
