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SEAMO 2018 — Paper A — Grade 1–2 Question 4

SEAMO · SEAMO 2018 — Paper A — Grade 1–2

Question 4

Evaluate $1+2+\cdots+9+10+9+8+\cdots+2+1$.
  1. $89$
  2. $90$
  3. $99$
  4. $100$
  5. None of the above