Suppose A and B are dependent events. If P (A|B) = 0.25 and P (B) = 0.8, what is P (AuB) ?

According to the rules of probability, the relationship between two dependent events is expressed in the following equation below

P (A|B) = P (A∩B) / P (B)

Substituting,

0.25 = P (A∩B) / 0.8

P (A∩B) = 0.2

The answer hence is 0.2