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HKIMO 2026 Grade 6 National Preliminary Set 01 Question 5

HKIMO · HKIMO 2026 Grade 6 National Preliminary Set 01

Question 5

Find the missing number: $2,6,18,54,?,486,1458,\ldots$.
  1. 126
  2. 162
  3. 216
  4. 261