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VTMO 2019 — Grade 5 — semifinal Question 8

VTMO · VTMO 2019 — Grade 5 — semifinal

Question 8

Color the octahedron’s faces so faces sharing an edge differ. What is the minimum number of colors?

Question illustration
  1. $2$
  2. $3$
  3. $4$
  4. $6$
  5. $8$