$A$ die is thrown. Describe the event $A$: a number less than $7$. Find $A \cup B$ if $B$ is the event of getting a number $3$.
- A$\{1, 2, 3, 4, 5, 6\}$
- B$\{1, 2, 3, 4, 5, 6, 3\}$
- C$\{1, 2, 3, 4, 5\}$
- D$\{3\}$
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