what is condition for p(AorB)=P(A)+P(B) where P(X) =probability of x

Dear Student,
Please find below the solution to the asked query:

We know thatPAB=PA+PB-PACHencePAB=PA+PB whenPAC=0 And PAC is 0 for mutually exclusive events i.e. when occurrence of one of event rejects the possibility of occurrence of the other i.e. both events cannot occur simultaneously.

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