# Stupid mailman

**Discrete Mathematics**Level pending

A mailman is asked to deliver four letters to four houses, and each letter is assigned to a different house. However, the mailman mixed up the addresses so he doesn't know which letter belongs to which house. Therefore, at each house, he gives a random letter.

What is the probability that the mailman gave the correct letter to exactly three houses?

Give your answer to 2 decimal places.