How is the probability of an intersection denoted in probability notation?

The probability of an intersection refers to the likelihood that two events, A and B, both occur simultaneously. In probability notation, this relationship is specifically represented as P(A ∩ B), where the symbol "∩" denotes the intersection of events A and B.

The notation P(A n B) is commonly used as an alternative way to denote the same concept, with "n" representing the intersection of the two events. Therefore, this option correctly conveys that we are interested in the occurrence of both A and B at the same time.

In contrast, the other notations represent different concepts. For instance, P(A ∪ B) signifies the probability of the union of A and B, which is the chance that at least one of the events A or B occurs. Meanwhile, P(A + B) is not standard in probability; it might imply a sum of probabilities rather than an intersection. Lastly, P(A, B) is often used informally but does not officially denote intersection in formal probability notation.

Thus, the choice that correctly denotes the probability of an intersection is indeed P(A n B).