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HKIMO 2026 Grade 6 National Preliminary Set 05 Question 9

HKIMO · HKIMO 2026 Grade 6 National Preliminary Set 05

Question 9

Find $144-143+142-141+140-\cdots+4-3+2-1$.
  1. 74
  2. 73
  3. 71
  4. 72