You are calculating a conditional probability. The formula P(ANB)/P(B) is used to determine the probability of event A given that event B has occurred, which is a fundamental concept in conditional probability.
To understand this better, let's break down the formula:
1. P(ANB) - This is known as the joint probability of A and B, which is the probability of both events A and B happening at the same time.
2. P(B) - This is simply the probability of event B occuring.
When you divide the joint probability by the probability of event B, you're essentially asking "given that B has happened, what is the probability that A also happens?" And that is the definition of conditional probability.
Hence, when you calculate P(ANB)/P(B), you are calculating a conditional probability.
Answer: conditional