Question: What does the general addition rule (Formula 4.3 on page 175) mean in the context of the probabilities in a joint probability distribution? In Formula

What does the general addition rule (Formula 4.3 on page 175) mean in the context of the probabilities in a joint probability distribution?
In Formula 4.3
If A and B are any two events, then
P(A or B) = P(A) + P(B) − P(A & B).

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