Question

In Probability, let A,B be two events.
We have these properties:
(1) P(A-B) = P(A) - P(AB)
(2) P(A U B) = P(A) + P(B) - P(AB)

What does the P(AB) term mean? What is it? :S

Answer 1

P(AB) is the probability that both A and B happen at the same time

Answer 2

@Jim766 Thank you Jim!