Problem #39 EASY
The Crowded Elevator
Microsoft Adobe Probability Statistics
Problem Statement
A 10-story building has an elevator. Seven people enter the elevator on the ground floor, each traveling to one of the upper 9 floors chosen independently and uniformly at random. What is the expected number of stops the elevator makes? What if there are n people and f floors?
Answer & Quick Explanation
Logged-in Users Only
You must be logged in to view the answer and check your solution. Signing up is free and takes less than a minute.
Detailed Editorial Solution
Detailed Editorial Solution is Premium
Unlock detailed step-by-step mathematical proofs, logic explanations, and company-specific interview preparation pathways.