sat math counting

[Jack]

There are 4 doors in a museum. In how many ways can a visitor enter and leave the museum?
(A) 4
(B) 8
(C) 16
(D) 64

[miranda]

The visitor can choose for his entry to the museum between 4 different ways and for his exit also between 4 different ways. Therefore the visitor can enter and leave the museum in 4*4=16 ways.
The correct answer is (C).

hope these help!

[Jack]

Thanks a lot!!