SOLUTION: Ten men are in a conference room with 4 doors. In how many ways can they leave the room?

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Question 984143: Ten men are in a conference room with 4 doors. In how many ways can they leave the room?
Answer by mathmate(429) About Me  (Show Source):
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Given:
ten men in a conference room
4 (distinct) exits are available..
Need to know how many ways the men can leave the room

Solution:

Each man has a choice of four exits/doors.
Assuming the order of the men leaving the room is not relevant, then there are
4%2A4%2A4%2A4%2A4%2A4%2A4%2A4%2A4%2A4=4%5E10 ways the men can leave the room