Answer
See below.
Work Step by Step
$P(B|A)$ indicates the probability of event $B$ happening if the event $A$ has occured. E.g. if we draw number from $1$ to $5$ from a hat without replacement, then the probability of drawing a $3$ and then a $4$ is: $\frac{1}{5}\frac{1}{4}=\frac{1}{20}=P(4|3)$