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VTMO 2019 — Grade 4 — semifinal Question 12

VTMO · VTMO 2019 — Grade 4 — semifinal

Question 12

Color the cardboard so regions sharing an edge differ. What is the fewest colors?

Question illustration
  1. $2$
  2. $3$
  3. $4$
  4. $5$
  5. $6$