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Mathematical probability formula P(AB)=? P(A+B)=？ P(A-B)=？ Wait and help explain what they mean.
The probability that a and b happen at the same time

P(AB)=P(A)P(B)

Probability of occurrence of a or b

P(A+B)=P(A)+P(B)—P(AB)

The probability that A happens and B doesn't.

P(A-B)=P(A)( 1-P(B))

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