BrainBashers Puzzles

At the local BrainBashers Internet despatch centre, the packing department was getting ready for the weekend.

However, it was late in the day and the final five packages were ready to be labelled.

Unfortunately, Fred dropped the labels to the packages and then had no idea which label belonged to which packet.

What is the probability that Fred managed to correctly label exactly four of the five packages?

[Ref: ZFWM]

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