There are 3 doors to a lecture room. In how many ways can a lecturer enter the room from one door and leave from another door?
Solution
Correct Answer: Option C
As the lecturer can't leave the hall by the door he/she enters.
So, number of ways can a student enter the hall through a door and leave the hall by a different door is = 3 × 2 = 6
So, number of ways can a student enter the hall through a door and leave the hall by a different door is = 3 × 2 = 6
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