Answer
$\dfrac{2}{5}$
Work Step by Step
We know that $\text{probability}=\dfrac{\text{number of favorable outcomes}}{\text{number of all outcomes}}=\dfrac{n(F)}{n(S)}.$
There are $4$ outcomes that favor the event $F$ and there are a total of $10$ possible outcomes in all.
Hence,
$P(F)=\dfrac{4}{10}=\dfrac{2}{5}$
