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https://en.wikipedia.org/wiki/Conditional_probability

In probability theory, **conditional probability** is a measure of the probability of an

event occurring .... The logic behind this **equation** is that if the possible outcomes

for A and B are restricted to those in which B occurs, this set serves as the new

**sample** .... If P(B) = 0, then according to the **simple** definition, P(A|B) is undefined.

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