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Hong, the mailperson, delivers 5 letters to five houses. what is the probability she delivers at least one letter correctly?

 Feb 22, 2021
 #1
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Count the probability that she delivers all the letters incorrectly. This is the number of derangements of 5, which is 44.

 

Probability: 1 - 44/120 = 19/30

 

Read more about derangements here: https://en.wikipedia.org/wiki/Derangement

 Feb 22, 2021
 #2
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thank you!

xxJenny1213xx  Feb 22, 2021

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