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HKIMO 2026 Grade 4 National Preliminary Set 05 Question 7

HKIMO · HKIMO 2026 Grade 4 National Preliminary Set 05

Question 7

Find the value of $1+2+3+\cdots+100+101+100+\cdots+3+2+1$.
  1. 10302
  2. 5151
  3. 10101
  4. 10201