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VTMO 2017 — Grade 6 — semifinal Question 1

VTMO · VTMO 2017 — Grade 6 — semifinal

Question 1

Thanh writes every two-digit number containing digit $6$. How many are there?
  1. $10$
  2. $19$
  3. $20$
  4. $17$
  5. $18$