is probability of occurrence of at least one of event A B=probability of occurrence of A or B=p(A+B) 

Dear student,
YES the probability of occurence of A or B and probability of occurence of atleast one of A or B is same.
it is generally denoted by P(AB) or P(A+B)
and P(AB)=P(A)+P(B)-P(AB)
if A and B are mutually exclusive events then P(AB)=0
in that case P(AB)=P(A)+P(B)


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