Probability of Correct Package Labeling

Brad Doe works for a packaging company. One day, he received four separate orders and accidentally mixed up the addresses, so he applied the
address labels at random. 

What is the probability that exactly three packages were correctly labeled?

Labeled Packages

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Common Sense in Finding Probability

Why this question?

Answer is 1!

If three are correctly placed fourth has to be. There are only 4!