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VTMO 2013 — Grade 7 — semifinal Question 9

VTMO · VTMO 2013 — Grade 7 — semifinal

Question 9

Use digits $1 \text{--} 8$ once to form two four-digit numbers. What is their maximum sum?
  1. $16173$
  2. $15308$
  3. $13086$
  4. $6912$
  5. $16665$