Tatiana’s teacher drew a 3 × 3 grid on the board, with zero in each cell.
The students then took turns to pick a 2 × 2 square of four adjacent cells, and to add 1 to each of the numbers in the four cells. After a while, the grid looked like the diagram on the right (some of the numbers in the cells have been rubbed out.)
What number should be in the cell with the question mark?
Select one option, then click Submit.
4
3
2
1
none
Select an option, then submit.
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