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

__the probability of occurence of A or B and probability of occurence of atleast one of A or B is same.__

**YES**it is generally denoted by $P(A\cup B)orP(A+B)$

and $P(A\cup B)=P\left(A\right)+P\left(B\right)-P(A\cap B)$

if A and B are mutually exclusive events then $P(A\cap B)=0$

in that case $P(A\cup B)=P\left(A\right)+P\left(B\right)$

enjoy

**
**