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5. How many unique positions of n rooks, where k are identically white and n - k identically black, on an n by n chessboard
5. How many unique positions of n rooks, where k are identically white and n - k identically black, on an n by n chessboard exists, such that no pair of rooks can attach each other? 6. Prove that() is even for all positive integers n. 7. For what positive values of n is2m) odd? n+1
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