Question

please define in words the following notation: p(a | b) the probability that a or b occurred the probability of b occuring when you already know a occured first. the probability that a and b occurred. the probability of a occuring when you already know b occured first. none of the above

Explanation:

In probability theory, $P(A|B)$ represents conditional probability. It is the probability of event A occurring given that event B has already occurred.

Answer:

The probability of A occurring when you already know B occurred first.