combinatorics - How many different ways can we place 4 identical rooks on the following chess board - Mathematics Stack Exchange

How many different ways can we place 4 identical rooks on the following chess board so that no two of them attack each other? I know when the board is $n \times n$ and we have $n$ towers then the

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combinatorics - In how many different ways can we place N identical rooks on a chess board WITHOUT CORNERS so that no two of them attack each other ( for N > 3)?

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combinatorics - How many different ways can we place 4 identical rooks on the following chess board - Mathematics Stack Exchange

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