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HKIMO 2026 Grade 5 National Preliminary Set 01 Question 8

HKIMO · HKIMO 2026 Grade 5 National Preliminary Set 01

Question 8

Find the value of $5+8+11+14+\cdots+155$.
  1. 8000
  2. 4000
  3. 4080
  4. 8160