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VTMO 2017 — Grade 3 — semifinal Question 9

VTMO · VTMO 2017 — Grade 3 — semifinal

Question 9

The digit sum of $123$ is $1+2+3=6$. How many three-digit numbers have digit sum $6$?
  1. $12$
  2. $16$
  3. $17$
  4. $18$
  5. $21$