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VTMO 2019 — Grade 3 — semifinal Question 14

VTMO · VTMO 2019 — Grade 3 — semifinal

Question 14

Pi creates the cube arrangements shown. How many small cubes does the eighth arrangement need?

Question illustration
  1. $18$
  2. $38$
  3. $49$
  4. $64$
  5. $81$