Find the number of ways to put 7 nonattacking rooks on the 7 by 7 chessboard
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Find the number of ways to put 7 nonattacking rooks on the 7 by 7 chessboard

(i) Find the number of ways to put 7 nonattacking rooks on the 7 by 7 chessboard below, with forbidden positions as shown. Express the answer as a specific integer, not just the formula.

(ii) Explain why your answer is correct.


Hint
Mathematics(i)A truth or a rule expressed using mathematical symbols is the formula. An equal sign is typically used to connect two or more values. When you are aware of the value of one quantity, you can use the formula to determine the value of the other....
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