The sentence given is divided into four parts. Identify the part with an error:
Dozen of (1) / mangoes were (2) / distributed among the boys (3) / by the class teacher. (4)
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Use "A dozen mangoes" instead of "Dozen of mangoes."
The phrase "Dozen of mangoes" should be corrected to "A dozen mangoes." The word "Dozen" does not require "of" unless a number is specified (e.g., "dozens of mangoes.").