Answer
See below.
Work Step by Step
If two events $A,B$ are mutually exclusive, then $P(\text{A or B})=P(A)+P(B)$. Assume we have the integers from $1$ to $10$ and we want to find the probability of randomly choosing a number less than $3$ or more than $8$. Then these are mutually exclusive and $P(\text{A or B})=\frac{2}{10}+\frac{2}{10}=\frac{4}{10}$
