Sudoku-style

How many possible solutions are there for completing the blank squares on this puzzle satisfying conditions (i) and (ii)?

8. For the following Sudoku-style puzzle, you are given the following 9-by-9 grid, and you need to fill it in with zeros and ones satisfying the following conditions: (i) Each row, each column, and each red or blue 3-by-3 box must contain exactly two ones and seven zeros. (ii) No two ones can be in […]

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