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VTMO 2016 — Grade 5 — semifinal Question 6

VTMO · VTMO 2016 — Grade 5 — semifinal

Question 6

Color the hexagons shown so edge-sharing cells differ. What is the minimum number of colors?

Question illustration
  1. $2$
  2. $3$
  3. $4$
  4. $6$
  5. $7$