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AIMO 2021 Primary 3 — Preliminary (Open Trial 1) Question 15

AIMO · AIMO 2021 Primary 3 — Preliminary (Open Trial 1)

Question 15

Calculate 120 −117 + 116 −113 + 112 −109 + ⋯+ 100 −97.
  1. 10
  2. 18
  3. 14
  4. 12