Suppose that we put 4 rooks on a standard 8 × 8 chess board so
that...
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Suppose that we put 4 rooks on a standard 8 × 8 chess board sothat none of the rooks can capture the others. This means that notwo rooks can appear in the same row or column. Furthermore,suppose that we do not put a rook in the upper left corner. Howmany ways can we do this?
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We have to divide it into 2 cases 1 No rook is placed on the left most column2 One rook is placed on the left most columnBy specifing column and row we give
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