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IMAS 2018 — Middle Primary Grades 3–4 — Round 2 Question 1

IMAS · IMAS 2018 — Middle Primary Grades 3–4 — Round 2

Question 1

What is the value of $100-97+94-91+88-85+\cdots+4-1$?
  1. 45
  2. 48
  3. 51
  4. 54
  5. 57