Juca wrote a whole number greater than zero in each of the boxes on the 3 × 3 board on the right, so that the sums of the numbers in each row and in each column are equal. The only thing Juca remembers

Juca wrote a whole number greater than zero in each of the boxes on the 3 × 3

board on the right, so that the sums of the numbers in each row and in each column
are equal. The only thing Juca remembers is that there are no three numbers repeated. What number is written in the box of the center?

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Juca wrote a whole number greater than zero in each of the boxes on the 3 × 3 board on the right, so that the sums of the numbers in each row and in each column are equal. The o…

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