MathForces: Math Olympiads
MathForces - Math Olympiadsβeta
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Author: mathforces
Problem has been solved: 10 times

Русский язык | English Language

21 buildings of different heights stand in a row along Independence Avenue. Jessy looked out the window of the last building towards the other buldings and counted $N$ buildings that she could see. If the taller buildings obstruct the lower ones, what is $[10X]$, where $X$ is the expected value of $N$.

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