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TIMO 2021 Grade 4 Preliminary Set 1 Question 7

TIMO · TIMO 2021 Grade 4 Preliminary Set 1

Question 7

Find the value of $1+2+3$+...+$100+101+100$+...+$3+2+1$.

Question illustration
  1. 10302
  2. 5151
  3. 10101
  4. 10201