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Number theory Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

Chloe chose a three-digit integer with all its digits different and wrote it on lots of pieces of paper. Peter picked some of the pieces of paper and added the three-digit integers on them. His answer was $2331$ . How many pieces of paper did Peter pick?

(A) $2331$ (B) $21$ (C) $9$ (D) $7$ (E) $3$

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