Below is a figure indicating a sample space $S$ and the probability of occurrences of events $A$ and $B$. Which colored section of the portion will indicate the probability of events $B$ and $A$ occurring simultaneously?

The probability of events $A$ and $B$ occurring simultaneously is represented by the intersection of the two sets, denoted as $A\cap B$.In a Venn diagram, the intersection is the overlapping region between the circles representing event $A$ and event $B$.Based on the description provided, the overlapping/shared region is colored white. Therefore, the white-colored area represents $P(A\cap B)$.