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VTMO 2021 — Grade 3 — titan-cup Question 6

VTMO · VTMO 2021 — Grade 3 — titan-cup

Question 6

Gray square cards form the pattern below. How many are needed for figure $100$?

Question illustration
  1. $99$
  2. $203$
  3. $197$
  4. $199$
  5. $201$