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SEAMO 2026 Paper B — Organizer self-practice SET 4 Question 12

SEAMO · SEAMO 2026 Paper B — Organizer self-practice SET 4

Question 12

Find $1-2+3-4+5-6+7-\cdots-2018+2019$.
  1. 840
  2. 1010
  3. 1060
  4. 2000
  5. 2018