Question
Asked Feb 16, 2019
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If 5 people get on an elevator which will stop on 9 floors, a) what is the probability that no two(or more) get off the same floor? b) What is the probability that at least two get off on the same floor?

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Expert Answer

Step 1

Given 5 people get on a elevator which will stop on 9 floors. 

We need to find probability that no two (or more) get off on the same floor.

The total number of people, who can get down in floor 1 is 9, total number of people, who can get down in floor 2 is 9. Here we cna see that floors are chosen independently. So we say the total number of 95, different ways  people can get down elevator.

Total events = 95.

The total number of ways o...

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Math

Probability

Basic Probability

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