Elevator, 24 people, 8 floors: prob. of stopping on floor 7 w/o you pushing button

ojhanaresh

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Jan 12, 2018
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There is a lift carrying 24 persons and you are one of them. There are total 8 floors in the building. You want to get down at the 7 th Floor. What is the probability that the lift will stop at 7 th Floor without you pressing any lift buttons?
 

stapel

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Joined
Feb 4, 2004
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There is a lift carrying 24 persons and you are one of them. There are total 8 floors in the building. You want to get down at the 7 th Floor. What is the probability that the lift will stop at 7 th Floor without you pressing any lift buttons?
What are your thoughts? What have you tried? How far have you gotten? Where are you stuck?

Please be complete. Thank you! ;)
 
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