Interpret the symbol PBA and explain what is meant by the ex

Interpret the symbol P(B|A) and explain what is meant by the expression. What do we know if P(B|A) is not the same as P(B)?

Solution

P(B | A) = probability of event B when we know that event A happenen, it is also called conditional probability of B, given A

When P(B|A) is not equal to P(B), we know that B is dependent on A (not independent)