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Question
A room has 8 doors. In how many ways, a man can enter in the room through one door and exit through a different door?
A room has 8 doors. In how many ways, a man can enter in the room through one door and exit through a different door?
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Solution
The correct option is C 56
A person can enter in a room through any one of 8 doors and exit from a different door in 7 ways (remaining 7 doors).
Total number of ways = 8 x 7 = 56
56
A person can enter in a room through any one of 8 doors and exit from a different door in 7 ways (remaining 7 doors).
Total number of ways = 8 x 7 = 56
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