In response Kim Runner to her Publication
I think the formula(s) VK included, in this case the Addition Theorem of Probability, are purposeful.
In response Cowboy w2b to his Publication
If A and B are any two events then the probability of happening of at least one of the events is defined as P(AUB) = P(A) + P(B)- P(A∩B)
makes me think of "terror, discovery or both" - Georgenews
