We will use the conditional probability <math>P(A \mid B)</math>, that is the probability that the <math>A</math> event occurs only after the event <math>B</math> has already occurred
We will use the conditional probability P ( A ∣ B ) {\displaystyle P(A\mid B)} , that is the probability that the A {\displaystyle A} event occurs only after the event B {\displaystyle B} has already occurred