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In probability, letters $A$ and $B$ are used to denote various events. Then we write $P(A)$ for the probability of event $A$ happening. Same for $P(B)$.

But I often see the notation $P(A\cup B)$ as well. What does it mean, and how is such a thing calculated?

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    Do you remember studying sets? This is the probability of the event $A\cup B$, the union of events $A$ and $B$. It represents the probability of $A$ or $B$.2012-09-23
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    Is this downvoted because it rudimentary?2017-03-26
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    @TheoreticalPerson the original version of the question was quite bad, it has been improved since (see the editing history)2018-01-10

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