Question: Q 3 : [ 5 points ] Let consider placing two rooks on a 4 * * * 4 chessboard so that no rook can

3

[5

points

]

Let consider placing two rooks on a

4^{* * *} 4

chessboard so that no rook can capture each other. That is

,

they are not allowed to be placed on the same row or the same column. The figures below are examples of valid and invalid states. What is the total number of invalid states?

The total number of invalid states is

Q3: [5 points] Let consider placing two rooks on a 4***4

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