is it true that probability of occurrence of event A or B =P(A+B) =P(A)+P(B)

Dear Student,
Given statement is not true .
Probability of occurence of A or B is denoted by P(AB)
and probability of occurence of A or B or atleast one of A or BP(AB)=PA+PB-PAB

if events are mutually exclusive then P(AB)=0
now P(AB)=P(A)+P(B)
hope this will help

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