There are 3 doors to a lecture room. In how many ways can a lecturer enter and leave the room?
(A) 1
(B) 3
(C) 6
(D) 9
(E) 12

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There are 3 doors to a lecture room. In how many ways can a lecturer enter and leave the room? (A) 1 (B) 3 (C) 6 (D) 9 (E) 12