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Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

Sacha places 25 counters into 14 boxes so that each box contains 1, 2 or 3 counters. No box is inside any other box. Seven boxes contain 1 counter. How many contain 3 counters?

(A) $2$ (B) $3$ (C) $4$ (D) $5$ (E) $6$

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