# 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 $P\left(A\cup B\right)$
and probability of occurence of A or B or atleast one of A or B$P\left(A\cup B\right)=P\left(A\right)+P\left(B\right)-P\left(A\cap B\right)$

if events are mutually exclusive then $P\left(A\cap B\right)=0$
now $P\left(A\cup B\right)=P\left(A\right)+P\left(B\right)$
hope this will help
enjoy

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