olymmath

HMMT 2004 C2

  • Combinatorics
  • Answer

How many ways can you mark 8 squares of an 8×88 \times 8 chessboard so that no two marked squares are in the same row or column, and none of the four corner squares is marked? (Rotations and reflections are considered different.)

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{1}{4}

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