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SEAMO 2016 — Paper A — Grade 1–2 Question 6

SEAMO · SEAMO 2016 — Paper A — Grade 1–2

Question 6

Find $1+2+3+\cdots+18+19+20$.
  1. $190$
  2. $195$
  3. $200$
  4. $210$
  5. $220$