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HKIMO 2026 Grade 4 National Preliminary Set 03 Question 8

HKIMO · HKIMO 2026 Grade 4 National Preliminary Set 03

Question 8

Find the value of $40-39+38-37+\cdots+4-3+2-1$.
  1. 20
  2. 40
  3. 30
  4. 10