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IMC 2023 Grade 7 — Selection round Question 8

IMC · IMC 2023 Grade 7 — Selection round

Question 8

Bình colors each square of a $3\times3$ grid red or green. How many colorings have at most one green square in each row and each column?
  1. $25$
  2. $28$
  3. $33$
  4. $34$
  5. $36$