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IMAS 2021 — Middle Primary Grades 3–4 — Round 1 Question 6

IMAS · IMAS 2021 — Middle Primary Grades 3–4 — Round 1

Question 6

What is the value of $2021-2020+2019-2018+2017+\ldots-2+1$?
  1. 1
  2. 1010
  3. 1011
  4. 1012
  5. 2021