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A room has 8 ...

Question

A room has 8 doors. In how many ways can a man enter the room by a door and exit by a different door?

A

64

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B

56

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C

49

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D

15

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Solution

The correct option is B 56
He can enter the room in 8 ways and exit by (8 – 1) = 7 doors
Hence required number of ways = $8 \times 7 = 56$

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