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VTMO 2015 — Grade 5 — semifinal Question 9

VTMO · VTMO 2015 — Grade 5 — semifinal

Question 9

Color each cube face with one color so adjacent faces have different colors. What is the minimum number of colors?
  1. $2$
  2. $3$
  3. $4$
  4. $5$
  5. $6$