$A$ die is thrown. Describe the following events: $A$: a number less than $7$,$B$: a number greater than $7$,$C$: a multiple of $3$. Find $B \cup C$.
- A$A = \{1, 2, 3, 4, 5, 6\}$
- B$B = \emptyset$
- C$C = \{3, 6\}$
- D$B \cup C = \{3, 6\}$
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