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VTMO 2016 — Grade 2 — semifinal Question 2

VTMO · VTMO 2016 — Grade 2 — semifinal

Question 2

There are $23$ books. An takes $1$, Binh $2$, Chau $3$. How many remain?
  1. $22$
  2. $21$
  3. $20$
  4. $18$
  5. $17$