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SEAMO 2020 — Paper A — Grade 1–2 Question 3

SEAMO · SEAMO 2020 — Paper A — Grade 1–2

Question 3

Find $1+2+3+4+\cdots+11+12$.
  1. $60$
  2. $64$
  3. $68$
  4. $72$
  5. $78$