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MathNet 2022-part-03 — 197 problems (EN–VI) Question 123

Math Olympiad Vault · MathNet 2022-part-03 — 197 problems (EN–VI)

Question 123

How many ways are there to place pawns on a $10 \times 8$ board in such a way that each $2 \times 2$ square contains exactly two pawns?