Skip to content / Đến nội dung
ThichHocToan.com

SEAMO 2027 - Paper A - SET 12 - Self-study Question 16

SEAMO · SEAMO 2027 - Paper A - SET 12 - Self-study

Question 16

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